Frontier Signals

Daily brief

May 23, 2026.

60 quantum research items collected on 2026-05-23; hardware, control, and industry signals routed.

108 items · Quantum, Chips, Power · All briefs

Quantum

60 quantum research items collected on 2026-05-23; hardware, control, and industry signals routed.

Hardware and Error Correction

  • Sudden death of entanglement, rebirth of magic

    Local Markovian noise cannot bring entanglement back, but it can bring magic back. Unlike separability, stabilizer membership is not preserved by local channels, allowing dissipation to push states out of the stabilizer polytope as well as in. Under local amplitude damping, the $n$-qubit GHZ family $α|0^n\rangle+β|1^n\rangle$ ($0<α<β$) loses its magic at a lower damping stre...

  • Quantum Batteries in two-dimensional material-based Josephson Junctions

    We investigate the solid-state implementation of a Dicke-like quantum battery consisting of a two-dimensional material-based Josephson junction inductively coupled to a resonator, using graphene as a representative example. In this configuration, Andreev bound states naturally act as non-interacting, energetically non-degenerate two-level systems, and the setup allows for bo...

  • Long-range nonstabilizerness of topologically encoded states from mutual information

    We study long-range nonstabilizerness (LRN), namely the obstruction to remove nonstabilizerness with shallow-depth local quantum circuits. In one-dimensional settings, the mutual information between disconnected spatial regions has proven to be a powerful tool to diagnose LRN. In this work, we focus on encoded states of two-dimensional topologically-ordered systems, and expl...

  • Ratchet Universality and optimal suppression of shot noise in biharmonically-driven tunnel junctions

    This Letter discusses two retrodictions of the law of ratchet universality which explain previous numerical and experimental results concerning the diode effect in conventional superconducting tunnel-junctions in one case, and controlled suppression of electron-hole pair generation in a tunnel junction in the other, both in the presence of biharmonic driving fields. Our stud...

  • The relative entropy of magic and its nonadditivity

    In most stabilizer-based quantum computing schemes, so-called magic states are a necessary resource for implementing non-transversal quantum gates. With the resource theory of magic, it is possible to analyze and quantify the generation of the non-stabilizer states. The relative entropy is a measure used in various resource theories. For single qubits, we characterize magic...

  • Quasinormal mode quantization of bound and propagating photons in complex lightguiding nanostructures for integrated devices

    Open optical or plasmonic resonators are placed on and connected through surfaces or via waveguides, forming complex lightguiding nanostructures, e.g. for integrated photonic quantum devices. We derive general boundary conditions for quasinormal modes that account for the structure's specific geometry. We then present a general quantization scheme for multiple, interacting q...

  • Electron modulation and ultrafast near-field imaging with vectorial laser fields

    Controlled interaction of laser light with electron beams is fundamental for ultrafast electron microscopy and electron-based quantum optics, yet their direct coupling is forbidden in free space. Here we use longitudinally polarized light at a thin membrane and show that the emerging focal fields can modulate the electron beam in a direct, coherent and linear way, without th...

  • Symmetry Breaking as Quantum Gate: Entropy and Weak Mixing Angle

    We establish a correspondence between two independent entropic probes -- the variation of Rényi mutual information (RMI) across the electroweak symmetry breaking (EWSB) transition and the stabilizer Rényi entropy (SRE) -- in tree-level $2\to 2$ elastic scatterings. After angular averaging, the RMI (helicity basis) and the SRE (fixed beam basis) exhibit identical dependence o...

Control and Quantum-AI Integration

  • Bottom-up open EFT for non-Abelian gauge theory with dynamical color environment

    We develop a bottom-up open effective field theory (EFT) for non-Abelian gauge theories within the Schwinger--Keldysh formalism. Instead of integrating out the environment completely and starting from a nonlocal influence functional, we retain the slow environmental response variables explicitly and construct a local system-environment EFT. The environmental sector is descri...

  • Optimal work extraction in measurement-based quantum Otto engines: Non-adiabaticity and generalized measurements can be beneficial

    Measurement-based quantum heat engines have attracted significant interest as alternatives to conventional thermal engines, as they replace the hot thermal reservoir with quantum measurements, thereby offering greater controllability and simpler implementation. Motivated by these advantages, we investigate a measurement-driven quantum Otto engine with a qubit working substan...

  • A Formal Basis for Quantum Cryptographic Exposure Measurement under HNDL Threat

    An adversary copies your encrypted traffic today and waits for a quantum computer to decrypt it later. How exposed are you? We show that the functional form of the answer is not merely a calibration choice -- it is structurally justified by three assumptions about adversarial production and value-decay dynamics. Under those assumptions, the HNDL compromise probability factor...

  • Reinforcement learning for ion shuttling on trapped-ion quantum computers

    Scalable trapped-ion quantum computing is commonly realized with modular chips that feature distinct zones with specific functionalities, such as storage, state preparation, and gate execution. To execute a quantum circuit, the ions must be transported between these zones. This process is called ion shuttling. To achieve reliable computation results, the shuttling process mu...

  • Factorization rule for multitime correlations in non-Markovian open quantum systems

    Experiments performed on quantum systems often measure multitime correlation functions. When quantum systems are weakly coupled to their environment, the time evolution of such correlation functions can be reduced to that of the reduced density matrix by the quantum regression theorem (QRT). While no QRT is available for general non-Markovian open quantum systems, we show th...

  • Computable lower bound of the parameterized entanglement monotone

    Although numerous measures of entanglement have been proposed so far, the calculation of a given faithful entanglement measure is a hard work since it is always involved in some optimization process. It is, therefore, important to estimate the lower bound of a given entanglement measure for an arbitrary quantum state. This results in a subject of intensive mathematical resea...

  • Q-PhotoNAS: Hybrid Quantum Neural Architecture Search Framework on Photonic Devices

    Photonic quantum computing is a promising platform for scalable quantum machine learning, but designing effective hybrid architectures remains challenging under hardware and optimization constraints. Existing approaches rely on manually tuned architectures that fail to account for the collaboration between classical preprocessing, phase encoding, and photonic circuit structu...

Commercial and Industry Context

  • Asymmetric quantum Rabi model, trap-dipole resonance, and quantum gates with optically trapped ultracold polar molecules

    Optically trapped ultracold polar molecules can have multiple long-lived states for coding quantum information, and can exhibit electric dipole-dipole interactions~(DDI) which enables entanglement generation. The general understanding on the quantized motion~(QM) of molecules in the traps is that it causes fluctuation of DDI. Here, we find that the molecular QM can realize a...

  • Quantinuum and bp Explore Quantum Computing for Seismic Imaging

    <a href="https://thequantuminsider.com/2026/05/22/quantinuum-bp-wave-physics-quantum-computing/" rel="nofollow" title="Quantinuum and bp Explore Quantum Computing for Seismic Imaging"><img alt="Quantinuum Logo - TQI" class="webfeedsFeaturedVisual wp-post-image" height="708" src="https://thequantuminsider.com/wp-content/uploads/2026/05/2026-05-22_11-09.png" style="display: bl...

Unrouted Items

  • How many systems can be dephased before the quantum switch becomes causally definite?

    Quantum processes with indefinite causal order -- so-called causally nonseparable processes -- can exhibit various advantages over quantum circuits with a fixed or a well-defined causal structure. A natural question is how much nonclassicality is required for a process to display causal nonseparability. Here we address this by investigating how many systems can be dephased (...

  • One-photon communication in atomic media

    We consider the problem of single-photon transmission through an atomic medium, using quantum channel fidelity to describe the resulting information loss. We find that the normalized fidelity decreases monotonically with coupling strength, establishing a performance bound for quantum communication through such media. Our results hold for several channel types and for determi...

  • Geometric Origin of the Non-Adiabaticity Parameter and Self-Limiting Instability in Driven Nonlinear Systems

    We establish that the non-adiabaticity parameter has a direct geometric interpretation as the instantaneous evolution speed of a driven quantum state in projective Hilbert space under the Fubini Study metric. In contrast to conventional asymptotic approaches, the proposed framework provides a strictly local geometric criterion that allows non-adiabatic instability and its no...

  • Adiabatic Quantum Phase Estimation

    Quantum phase estimation (QPE) is a central algorithmic primitive that estimates eigenvalues of a Hamiltonian up to precision $ε$ in Heisenberg-limited time $T=Θ(1/ε)$. Standard gate-based implementations of QPE require deep controlled time-evolution circuits and are not native to analog hardware. Here, we present a simple adiabatic protocol for QPE that achieves (up to loga...

  • A sharp interaction-degree threshold for simulating QAOA

    We identify a sharp interaction-degree threshold for the classical simulation of QAOA with $2$-local cost functions. At degree $3$, classical sampling from depth-$1$ QAOA with small multiplicative error would collapse the polynomial hierarchy to its third level. At degree $2$, exact classical sampling from depth-$p$ QAOA on $n$ qubits runs in time $n^{O(1)}$ whenever $p = O(...

  • Quantum circuit design via dynamic Pauli constraints

    We introduce a novel software-oriented model of quantum computation motivated by the practical constraints of near-term quantum hardware. In this model, gates are specified by constraints expressed in terms of Pauli observables, with each disjoint layer of gates accompanied by a pairwise or $k$-local quantum state tomography of the device. We prove that the model is equivale...

  • Self-testing of exact entanglement embezzlement

    We consider bipartite exact entanglement embezzlement with a catalyst state vector $ψ$ in a Hilbert space $\mathcal{H}$ using unitaries (or more generally, contractions). If $\mathcal{M} \subseteq \mathcal{B}(\mathcal{H})$ is a von Neumann algebra and $U \in M_d \otimes \mathcal{M}$ and $V \in \mathcal{M}' \otimes M_d$ are unitaries (or more generally contractions), then suc...

  • Practical Countermeasure Against Attacks Exploiting Detection Efficiency Mismatch in Quantum Key Distribution

    We demonstrate a practical countermeasure against a well-known class of attacks on quantum key distribution (QKD) systems that exploit detection efficiency mismatch, where the receiver's detectors do not exhibit identical responses to incoming photons across all degrees of freedom. This class of quantum hacking strategies is broad and significantly includes the time-shift at...

  • Entanglement Dynamics across a Monitored Quantum Point Contact

    We compute the entanglement dynamics across a monitored quantum point contact, where particle losses are recorded on a given site, and demonstrate how this single-site local monitoring substantially reshapes the entanglement production. Contrary to the unitary case, where entanglement entropy grows logarithmically in time, here we find first a linear growth, up to a maximum...

  • Joint Unitarity and a Single Definite Outcome in a Quantum Measurement

    We investigated the possibility that a single measurement run with a definite outcome is a joint unitary evolution of all the participating systems, and measurement runs with different definite outcomes correspond to different unitary maps. With reasonable assumptions, we derived a lower bound of the dependence of the environment after measurement on the state of the system...

  • Reduced Dynamical Maps in Finite Temperature Vibronic Coupling Models via Choi Matrices: Numerical Methods and Applications

    We present a streamlined implementation of a computational framework for constructing and analyzing reduced dynamical maps for complex system--bath models at finite temperature. The methodology is based on three established ingredients of quantum dynamics: the Choi--Jamiołkowski isomorphism for the representation of quantum channels, thermofield (TFD) purification of thermal...

  • Minimal Permutation-Invariant Qudit Codes from Edge-Colorings of Complete Graphs

    We study permutation-invariant quantum codes in the symmetric subspace $\mathrm{Sym}^n(\mathbb{C}^q) $ of $n$ qudits of local dimension $q$. For every integer $q\geq 2$, we construct a permutation-invariant code with parameters $((4,q,2))_q$. Thus four physical qudits suffice to encode one logical qudit with distance two in the symmetric sector for every local dimension. We...

  • QuCtrl-BELL: A Compiler-Driven Sub-Microsecond Feedback Control Stack for Scalable Trapped-Ion Quantum Experiments

    As trapped-ion quantum computing scales to larger qubit registers and more complex control protocols, classical control systems face a fundamental tradeoff: sub-microsecond board-level feedback requires tight hardware coupling, whereas maintainability and extensibility require clean, modular software abstractions. This paper presents QuCtrl-BELL (Bell), a compiler-driven sof...

  • Dual wavelength source of entanglement for space quantum communication

    We report the demonstration of a bulk, intrinsically phase-stable source of polarization- and time-energy-entangled photon pairs at 810nm and 1550nm, directly coupled into single-mode optical fibers. This highly non-degenerate wavelength combination is well suited for hybrid quantum communication networks, enabling low-loss transmission in optical fibers at 1550nm while main...

  • Shielded inner-shell transitions in atomic samarium for tests of fundamental physics

    Forbidden atomic transitions provide some of the most stringent low-energy tests of physics beyond the Standard Model, with sensitivity set by the interplay between the sought-for signals and systematics suppressed by symmetry. Here we identify the previously unobserved $4f^{6}6s^{2}\,{}^{5}$D$_{0}$ level of neutral samarium at $14\,564.90(2)\,\mathrm{cm}^{-1}$, opening the...

  • Modular Variables and the Limits of Phase Detectability in Open Quantum Systems

    Modular variables serve as a striking example of quantum nonlocality, particularly in superpositions of wave packets that are spatially well separated, where the relative phase between components cannot be accessed through conventional local measurements. In this work, we explore the time evolution of Hermitian modular operators for Gaussian wave-packet superpositions under...

  • Emulation of Optically Interconnected Quantum Data Centers Topologies for Cost-Fidelity Benchmarking

    We emulate optically interconnected quantum processors in ring, star, and line topologies using a quantum computer. GHZ benchmarks show that the star provides the best trade-off between cost and fidelity under transduction and fiber noise.

  • Statistical Interpretation of the Procedures Measurement of Physical Quantities

    This work develops a conceptual framework for the foundations of quantum physics, linking two main approaches: the algebraic formulation and quantum probability. Rather than proposing new axioms or theories, the text reorganizes and synthesizes existing models, highlighting their assumptions, conceptual structures, and operational significance. The analysis begins with von N...

  • Geometric Construction of Optimal Teleportation Witnesses

    Not all entangled states are useful for quantum teleportation. We present a geometric method to construct optimal teleportation witnesses, which provide operational necessary and sufficient criteria for identifying the teleportation usefulness of arbitrary two-qudit entangled states. Specifically, by developing a two-layer iterative cutting-plane algorithm to solve the short...

  • Three sins against physics by an exaggerated quantum information perspective

    I point out three ways in which the perspective of quantum information may lead to distorted claims about physics: forgetting that light does not need to be quantised to show coherence; ignoring the generators of unitary evolutions; and approaching the discovery of nature as a fight against an adversary.

  • Unified entropy entanglement

    The unified entropy as a promotion of the von Neumann entropy exhibits distinct diversity which contains the Tsallis entropy, the Rényi entropy, the von Neumann entropy as special cases. The unified-($r,t$) entropy entanglement with $0<r<1$ and $0< t\leq 1$ was shown to be an entanglement monotone in literature. In this paper, we explore unified-($q,s$) entropy entanglement...

  • Sensitivity Evaluation of SU(1,1) Interferometers with Arbitrary Input Probe State and Homodyne Detections

    We provide a general theoretical derivation of the phase sensitivity achieved by SU(1,1) interferometers under homodyne detection. The general expressions obtained accommodate arbitrary input states and include internal and external losses. In this systematic review, both full SU(1,1) interferometers with two parametric amplifiers and the truncated interferometers with only...

  • Realizing tunable non-Hermitian skin effects in dynamical quantum systems via the relative phase between multiple time-periodic driving

    We demonstrate how the relative phase between the multiple time periodic driving can decide the emergence and the favorable localization direction of non-Hermitian skin modes. For the static non-Hermitian quantum chain with parity time symmetry, non-Hermitian skin effects (NHSEs) can be prohibited. As the dynamical driving is turned on, NHSEs get artificially reactivated, wh...

  • Nonclassical Cutoff Fluctuations in Squeezed-Light-Driven High-Harmonic Generation

    Strong-field high-harmonic generation (HHG) is conventionally described semiclassically, with the driving laser treated as a classical field. This approximation becomes insufficient in nanoscale interaction geometries, where extreme spatial confinement raises the vacuum-field amplitude to the ~10^-2 level relative to the driving-field amplitude. When the quantum fluctuations...

  • Multi-Modal Spectroscopy Theory for Ultrafast Control of Rabi Oscillations

    We propose a three-cavity scheme to realize full control of the emitter-cavity coupling strength in cavity quantum electrodynamics (cQED). The involvement of coupled oscillators gives rise to transient dynamics comprising multiple spectral components, which significantly increases the numerical cost to resolve the fluorescence spectrum in the time domain. A generalized senso...

  • A2QTGN: Adaptive Amplitude Quantum-Integrated Temporal Graph Network for Dynamic Link Prediction

    Dynamic link prediction is important for modeling evolving interactions in complex systems, including social, communication, financial, and transportation networks. Classical temporal graph models capture sequential dependencies, but they may struggle to represent concurrent and rapidly changing node-edge interactions in large dynamic graphs. We propose A2QTGN (Adaptive Ampl...

  • Phase-tunable remote nonreciprocal charging in waveguide QED

    Remote quantum batteries require directional and controllable energy transfer between spatially separated quantum nodes, yet most existing protocols rely on direct charger-battery Hamiltonian couplings. Here we propose a phase-tunable waveguide-QED architecture for remote quantum-battery charging, in which a driven charger and a remote battery are coupled solely via engineer...

  • Dissipation-Selected Resonant Fronts in a Driven-Dissipative Bose-Hubbard Lattice

    Spatially structured dissipation organizes driven quantum matter beyond Hamiltonian control. We show that a dissipation gradient combined with a Stark-induced detuning ramp selects a nonlinear resonance slice in a two-dimensional driven-dissipative Bose-Hubbard lattice, producing a pinned density front in generalized Gross-Pitaevskii simulations. The underlying resonance con...

  • Photon Anomalous Blockade in Waveguide Cavity QED with Atomic Mirrors

    Waveguide cavity quantum electrodynamics (QED) with atomic mirrors is a growing research area of quantum optics and can be applied to quantum information processing. We here study the photon statistics of output fields from a waveguide cavity QED system, in which the waveguide is coupled to quantized mirror atoms and one driven medium atom. Our results show that the photon b...

  • Device-Independent Quantum Secret Sharing Protocol Enhanced by Advantage Distillation

    Device-independent quantum secret sharing (DI-QSS) provides high security by eliminating the need to trust devices, yet its practical performance is limited by channel loss and noise. This work extends advantage distillation from two-party quantum key distribution (QKD) to three-party DI-QSS, redesigning the corresponding data interaction and verification procedures. The tec...

  • Top 20 Quantum Computing Masters & Ph.D. Degree Programs in 2026

    <a href="https://thequantuminsider.com/2026/05/22/top-20-quantum-computing-masters-ph-d-programs/" rel="nofollow" title="Top 20 Quantum Computing Masters &amp; Ph.D. Degree Programs in 2026"><img alt="Quantum education - TQI" class="webfeedsFeaturedVisual wp-post-image" height="716" src="https://thequantuminsider.com/wp-content/uploads/2026/05/quantum-education.png" style="d...

  • Quantum Dynamics Advance Overturns Claim of ‘Quantum Supremacy,’ Opens New Research Directions

    <a href="https://thequantuminsider.com/2026/05/22/quantum-dynamics-advance-overturns-claim-of-quantum-supremacy-opens-new-research-directions/" rel="nofollow" title="Quantum Dynamics Advance Overturns Claim of ‘Quantum Supremacy,’ Opens New Research Directions"><img alt="Quantum Supremacy" class="webfeedsFeaturedVisual wp-post-image" height="392" src="https://thequantuminsid...

  • SBQuantum Secures $3 Million in Canadian Defence Contracts

    <a href="https://thequantuminsider.com/2026/05/22/sbquantum-canada-defence-contracts-3-million/" rel="nofollow" title="SBQuantum Secures $3 Million in Canadian Defence Contracts"><img alt="SBQuantum logo - TQI" class="webfeedsFeaturedVisual wp-post-image" height="674" src="https://thequantuminsider.com/wp-content/uploads/2026/05/2026-05-21_19-21.png" style="display: block; m...

  • Illinois Report Highlights Growth in Quantum Workforce Development

    <a href="https://thequantuminsider.com/2026/05/22/illinois-national-leader-quantum-workforce-development/" rel="nofollow" title="Illinois Report Highlights Growth in Quantum Workforce Development"><img alt="IQMP logo - TQI" class="webfeedsFeaturedVisual wp-post-image" height="696" src="https://thequantuminsider.com/wp-content/uploads/2026/05/2026-05-22_11-45.png" style="disp...

  • Xanadu Develops More Efficient Quantum Read-Only Memory Method

    <a href="https://thequantuminsider.com/2026/05/22/xanadu-breakthrough-lowers-cost-of-quantum-applications/" rel="nofollow" title="Xanadu Develops More Efficient Quantum Read-Only Memory Method"><img alt="Xanadu logo - TQI" class="webfeedsFeaturedVisual wp-post-image" height="690" src="https://thequantuminsider.com/wp-content/uploads/2026/05/2026-05-22_11-20.png" style="displ...

Chips

46 chip stack items collected on 2026-05-23; memory, packaging, compute, and foundry signals routed.

Compute Accelerators

Memory and Advanced Packaging

  • With Chiplets, What Role Does Economics Play?

    <p>Costs can rise with chiplets. Will that change? Will it matter?</p> <p>The post <a href="https://semiengineering.com/with-chiplets-what-role-does-economics-play/">With Chiplets, What Role Does Economics Play?</a> appeared first on <a href="https://semiengineering.com">Semiconductor Engineering</a>.</p>

  • Low-Temp Solders Are Suddenly Critical For Chiplets And Photonics

    <p>Warpage, heat, and brittleness can cause huge reliability problems for expensive designs.</p> <p>The post <a href="https://semiengineering.com/low-temp-solders-are-suddenly-critical-for-chiplets-and-photonics/">Low-Temp Solders Are Suddenly Critical For Chiplets And Photonics</a> appeared first on <a href="https://semiengineering.com">Semiconductor Engineering</a>.</p>

Foundry, Tools, and Capex

Unrouted Items

Power

22 power layer items collected on 2026-05-23; data center load, grid, generation, and cooling signals routed.

Data Center Power Demand

  • Data center server energy use grows across the commercial building stock

    In the Annual Energy Outlook 2026 (AEO2026), our long-term outlook, we project electricity consumed by data center servers will increase across the commercial building stock, increasing more in standalone data centers than in all other data center rooms combined. By 2050, server consumption alone reaches between 446 billion kilowatthours (BkWh) and 818 billion BkWh. The high...

  • Commercial electricity sales have soared in Virginia, driven by data centers

    Commercial electricity sales in Virginia increased by nearly 30.0 million megawatthours (MWh) between 2019 and 2025, much faster growth than in any other state except Texas, a much larger state, according to our Annual Electric Power Industry Report. The growth in sales of electricity in Virginia is largely driven by a concentration of data centers, as well as electric vehic...

  • Small modular reactors and microreactors under development in the United States

    Electric utilities in the United States currently operate about 98 gigawatts (GW) of nuclear generating capacity, but very little nuclear capacity has been built in the last few decades. High capital costs and lengthy licensing and approval processes have limited the expansion of nuclear power. However, several companies are developing new small modular reactor (SMR) designs...

  • U.S. coal-fired generating capacity retired in 2025 was the least in 15 years

    During 2025, the U.S. electric power sector retired 2.6 gigawatts (GW) of coal-fired generating capacity at four power plants, the least since 2010. At the beginning of 2025, coal plant operators had planned to retire 8.5 GW of capacity; however, 4.8 GW of planned retirements were delayed to a future year, and the operators of two coal plants (1.1 GW) cancelled plans to reti...

  • Rooftop solar photovoltaic systems account for 20% of Puerto Rico's capacity mix

    Rooftop solar generating capacity in Puerto Rico totaled 1,456 megawatts (MW) at the end of 2025, 20% of the overall capacity mix. Rooftop solar capacity has increased faster than other sources over the past decade. Between 2016 and 2025 rooftop solar installations accounted for 81% of the new generating capacity in Puerto Rico, according to data from our Electric Power Mont...

  • ENKA and GE Vernova mark the start of commercial operation of Türkiye’s first HA-powered plant

    Kırklareli, Türkiye -&nbsp;(May 12, 2026) ENKA and GE Vernova Inc (NYSE: GEV) today announced the start of commercial operations at the 852&nbsp;megawatts (MW) Kırklareli power plant in Kırklareli, about 20 miles from the Bulgarian border in Türkiye. The facility is the&nbsp;first HA-powered plant

Grid and Generation

Unrouted Items

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