August 26, 2026.

Photonic Publishes SHYPS QLDPC Code Results in Nature CommunicationsTier 2

<a href="https://thequantuminsider.com/2026/08/26/photonic-shyps-quantum-error-correction-nature-communications/" rel="nofollow" title="Photonic Publishes SHYPS QLDPC Code Results in Nature Communications"><img alt="SHYPS QLDPC codes" class="webfeedsFeaturedVisual wp-post-image" height="659" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-25_20-55.png"...

Distributed Resource Theory of Entanglement and MagicTier 3

In distributed fault-tolerant quantum computing, entanglement and magic are essential resources for quantum communication and universal fault-tolerant computation, respectively. Although they are usually treated as distinct resource currencies, whether they admit a unified resource-theoretic description remains an open question. Here, we introduce the distributed resource th...

Improved Quantum Codes with Transversal T GatesTier 3

In this work, we study quantum CSS codes with transversal $T$ gates. Here, $T$ gate transversality is meant in the strongest sense; the application of physical $T$ to every physical qubit yields logical $T$ on every logical qubit, without Clifford corrections. Despite the importance of the $T$ gate in fault-tolerant quantum computation, the parameters of asymptotic families...

Geometry-controlled correlated electric-field noise in enclosed ion traps from billiard return spectraTier 3

We ask how passive conducting geometry determines the spatial structure of electric-field noise seen by trapped ions. From a boundary-potential covariance and the Dirichlet Green function we construct the $N$-ion electric-field cross-spectral matrix and its blockwise motional Kossakowski generator. In a parallel slab, billiard unfolding turns the electrostatic response into...

Scalable Lindblad Noise Learning via Stochastic Tensor-Network SimulationTier 3

Learning dissipation rates in large-scale open quantum systems is a major obstacle for near-term quantum technologies, as existing Lindblad estimation methods are typically limited to small system sizes due to the computational complexity of repeatedly solving the Lindblad equation during optimization. Here, we propose a scalable noise-learning framework for Lindblad dissipa...

AlGaAs nanowires as a universal platform for GaAs, InGaAs, and InAs quantum dotsTier 3

Optical quantum dots (QDs) are central to photonic quantum technologies, with fabrication approaches tailored to different spectral ranges. A key challenge, however, is the realization of a unified platform$\unicode{x2014}$a single growth method combined with a host material offering a designable architecture$\unicode{x2014}$enabling wavelength tunability across the full emi...

Nearly Optimal Amplitude Estimation at any DepthTier 3

We develop a class of amplitude estimation algorithms with tunable circuit depth $M$ and circuit repetitions $N$, requiring neither ancilla qubits nor controlled Grover operations. For additive error $ε$ in the Grover angle, they attain the nearly optimal query-depth tradeoff $M^2N\in\widetilde{O}(ε^{-2})$ uniformly over $λ\in[0,π/2]$, spanning the full range from classical...

Towards Stirling cooler operable single-photon sources based on low-noise GaAs quantum dotsTier 3

For photonic quantum technology applications, sources capable of emitting photons with indistinguishability close to unity are essential. Ideally, these sources should not require demanding cooling systems. Here, we present temperature-dependent two-photon-interference measurements on photons produced by the radiative decay of the negative trion in a low-noise GaAs quantum d...

Efficient, precise DFT calculations of NMR shieldings: Revisiting the finite field approachTier 3

Absolute nuclear magnetic shielding constants and relative chemical shifts are second-derivative response properties that underpin the interpretation of Nuclear Magnetic Resonance (NMR) spectra and provide critical insights into the structural and electronic environments of diverse chemical systems. However, their accurate computation is often constrained by the need for met...

A Theory of Finite-Noise Optima and Generalization in Quantum Machine LearningTier 3

Quantum noise is expected to degrade quantum machine learning by driving circuits away from their noiseless implementations. Yet recent studies show moderate noise can reduce testing error, a behavior unexplained by weak-noise perturbative error accumulation or strong-noise trainability collapse. Here we develop a statistical learning theory connecting microscopic noise proc...

Efficient Treatment of Non-Linearity in Quantum Computational Fluid Dynamics Using Hybrid Tensor NetworksTier 3

Nonlinear terms present a fundamental challenge for quantum computational fluid dynamics, as their implementation on inherently linear quantum hardware typically requires resource-intensive workarounds that limit scalability to large-scale simulations. We present a hybrid quantum-classical tensor network algorithm that addresses this bottleneck by combining variational time-...

QML for Quantum Sensing under Measurement-Induced Information LossTier 3

Nitrogen-vacancy (NV) centers in diamond can serve as highly sensitive solid-state quantum sensors for high-sensitivity magnetometry. However, in the noisy intermediate-scale quantum (NISQ) era, extracting reliable information from noisy, finite-shot, and measurement-limited sensing data remains a considerable challenge. Whereas, quantum machine learning (QML) offers a poten...

Observation of electron spin interactions between Rydberg atomsTier 3

We report the observation of electron spin interactions between Rydberg atoms, which are driven by spin-orbit coupling through second-order dipole perturbation and exhibit a spatial anisotropy governed by the atomic configuration. Specifically, we observe coherent electron spin exchange dynamics, with the measured coupling strength agreeing well with both numerical calculati...

DOE Awards $7.3M for Quantum Research in High-Energy PhysicsTier 2

<a href="https://thequantuminsider.com/2026/08/26/doe-awards-7-3m-quantum-research-high-energy-physics/" rel="nofollow" title="DOE Awards $7.3M for Quantum Research in High-Energy Physics"><img alt="An aerial view of the future Electron-Ion Collider (EIC)" class="webfeedsFeaturedVisual wp-post-image" height="660" src="https://thequantuminsider.com/wp-content/uploads/2026/08/...

NSF Renews Illinois-Led HQAN With $37.5M for Modular Quantum ComputingTier 2

<a href="https://thequantuminsider.com/2026/08/26/nsf-renews-illinois-led-hqan-37-5m-modular-quantum-computing/" rel="nofollow" title="NSF Renews Illinois-Led HQAN With $37.5M for Modular Quantum Computing"><img alt="Brian DeMarco" class="webfeedsFeaturedVisual wp-post-image" height="748" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-26_11-52.png" sty...

IonQ Appoints Eric Ball and Timothy Baxter to BoardTier 2

<a href="https://thequantuminsider.com/2026/08/25/ionq-appoints-eric-ball-timothy-baxter-board/" rel="nofollow" title="IonQ Appoints Eric Ball and Timothy Baxter to Board"><img alt="IonQ logo" class="webfeedsFeaturedVisual wp-post-image" height="662" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-25_20-46.png" style="display: block; margin: auto; margi...

Researchers Develop Quantum Memories for Long-Distance NetworksTier 2

<a href="https://thequantuminsider.com/2026/08/26/researchers-develop-quantum-memories-long-distance-networks/" rel="nofollow" title="Researchers Develop Quantum Memories for Long-Distance Networks"><img alt="Image portraying quantum effects." class="webfeedsFeaturedVisual wp-post-image" height="645" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-25_22...

Dynamical Consequences of Nontrivial Topology of Molecular Conical IntersectionsTier 3

The topology of the electronic structure for an avoided crossing and a conical intersection (CI) is different and is characterized by the presence of the geometric phase in the electronic wavefunction in the latter. Using the linear Jahn-Teller model, we show that an avoided crossing can be created from the conical intersection while preserving the nontrivial topology of the...

Certified Randomness without Structure Against Shallow-Query AdversariesTier 3

In a recent breakthrough, Yamakawa and Zhandry (J. ACM 2024) constructed a proof of quantumness in the quantum random oracle model (QROM) in which the quantum prover samples a codeword preimage of a publicly computable function H. They conjectured that given any H, a successful prover must sample their preimage from a high-entropy distribution over possible answers. If true,...

Masked Differential-linear Distinguishers and Quantum ApproachesTier 3

We introduce masked auto-correlation, a new primitive for the cryptanalysis of symmetric-key primitives, together with a quantum attack pipeline built on it. For a permutation $f$, output masks $α,β$, and an input difference $w$, masked auto-correlation (MAC) measures the correlation between the masked outputs $α\cdot f(x)$ and $β\cdot f(x\oplus w)$. The associated masked di...

Graphix: A software framework for Measurement-Based Quantum ComputationTier 3

Measurement-based quantum computing (MBQC) is a powerful model for quantum computation, but dedicated software tools that bridge its theoretical foundations with practical research workflows remain limited. We present Graphix, a software framework for MBQC written in Python that provides a unified environment for developing, integrating, and exploring measurement-based proto...

Certified Fidelity Susceptibility from Classical ShadowsTier 3

Fidelity susceptibility is a useful probe of quantum phase transitions and quantum metrology, but its direct evaluation on a quantum device is challenging. By integrating Krylov-subspace methods with a resolvent-based reformulation, we present a method for certifying fidelity susceptibility using randomized single-copy measurements across repeated ground-state preparations....

Towards Optimal Quantum Estimators for State Frame PotentialTier 3

The state frame potential is a standard diagnostic of how closely a quantum state ensemble approximates Haar randomness. In this work, we study the problem of estimating the state frame potential of order $t$ to within additive error $\varepsilon$ under three progressively weaker access models: (i) query access to a multi-state-preparation oracle, (ii) general sample access,...

Previously: 2026-07-31

Non-Subhomogeneity of Minimal Operator Systems over Positive Semidefinite and Lorentz ConesTier 3

The minimal operator systems over ${\rm Mat}_k(\mathbb C)_+$, $k\geqslant2$, and the Lorentz cones $\mathcal L_m$, $m\geqslant4$, are not subhomogeneous. For the $2\times2$ cone we construct extreme positive maps of arbitrarily large output dimension. Positive retracts give the remaining cases. Equivalently, for fixed $k\geqslant2$ and $d$, there exist $s>d$ and an entangled...

When Similarity Is Interaction-Driven: Quantum Kernels for Regime-Sensitive LearningTier 3

Similarity in many decision systems is governed not by distance alone but by interactions among variables. In fraud and anomaly detection, small local perturbations can cross interaction-sensitive decision boundaries while leaving ambient distance almost unchanged. Motivated by this setting, we introduce a thin-slab interaction model and an interaction-driven quantum kernel...

Long-Range Order and Composite Boson Condensation in Lattice Quantum Hall StatesTier 3

Topological states of matter, such as quantum Hall states, are characterized by the absence of local order parameters. In the continuum, their topological order has been reinterpreted as the condensation of nonlocal composite bosons, but this condensation and the resulting long-range correlations have so far eluded direct confirmation beyond the simplest trial states. Here,...

Transport interpretation of entanglement Hamiltonian cumulants in integrable quantum quenchesTier 3

We study the dynamics of the cumulants of the entanglement Hamiltonian in interacting integrable models following global quantum quenches. Building on recent results based on space-time duality, we show that these cumulants are exactly given by the cumulants of currents of suitable conserved charges evaluated in the macrostate selected by the initial state. This establishes...

Quantum Change Intervals: Exact Asymptotic Localization with Collective MeasurementsTier 3

We study exact-label minimum-error localization of a transient, calibrated pure-state change occupying one nonempty contiguous interval in an otherwise stationary sequence of independent outputs, allowing arbitrary collective measurements. Let $c=|\langle 0|ψ\rangle|$ be fixed as the sequence length grows. For each fixed known interval length $i$, as the number $N$ of admiss...

Provable Quantum--Classical Separation for Continuous Gibbs SamplingTier 3

We prove the first quantum--classical separation for a sampling problem over a continuous domain. For a class of Gibbs states $p\propto e^{-βE}$ on the torus $\mathbb{T}^d$ with smooth ($s$-Gevrey) potential and barrier amplitude $α=e^{βΔ}$, where $Δ= \max E-\min E$, every classical algorithm---querying the value, gradient, or any higher-order derivatives of the log-density-...

Previously: 2026-08-13

Bound State Analysis of Rank-One Delta Interactions Supported by Deformed HyperspheresTier 3

We study rank-one delta interactions supported by small normal deformations of an \(n\)-dimensional hypersphere \(S_R^n\subset\mathbb{R}^{n+1}\). The interaction is defined by the normalized surface measure on the support and therefore corresponds to the rotationally invariant sector of the hyperspherical shell problem. For the undeformed hypersphere, we derive the bound-sta...

Quantum simulation of circular cluster interactions in a linear spin chainTier 3

The preparation of ground states of Hamiltonians with symmetries that are fundamentally different than those of the underlying device is a central challenge for quantum technologies. Here, we address this challenge with an analog protocol for the iconic generalized cluster Hamiltonian with the translational symmetry resultant from periodic boundary conditions based on a magn...

Optimal Lower Bound for Ground-State Energy Estimation with a Guiding StateTier 3

The guided Hamiltonian problem is the following: given access to the unitary $U=e^{i H}$ for some Hamiltonian $H$, and given access to a unitary that prepares a guiding state promised to have overlap at least $γ>0$ with the ground space of $H$, estimate the ground-state energy of $H$ within additive error $δ> 0$ and success probability at least $1-\varepsilon $, $\varepsilon...

Optimal Quantum Algorithm for Ground-State Energy Estimation with a Guiding StateTier 3

In the problem of ground-state energy estimation, one aims to estimate the smallest eigenvalue of a Hamiltonian, often given a guiding state, with some promised overlap $γ$ with the ground space. The main approach to this problem is to simulate its evolution, and estimate the smallest (or equivalently, largest) eigenphase of the resulting unitary $U$. We give a quantum algor...

Optimal copy complexity of quantum state cloningTier 3

Quantum state cloning is the task of approximately producing additional copies of an unknown quantum state from a finite number of input copies. The optimal cloning fidelity is known exactly for pure states, but no comparable characterization is known for general mixed states. We determine the optimal asymptotic copy complexity for $d$-dimensional states of rank at most $r$:...

Tunable-Size Unruh-DeWitt Detector in a Multimode CavityTier 3

Quantum simulators based on Bose-Einstein condensates (BECs) provide a powerful platform to study relativistic quantum-field phenomena in the lab and in particular emulate relativistic analog particle detectors. However, such detectors typically couple to excitations beyond the acoustic phonon regime, so that the nonlinear Bogoliubov dispersion introduces corrections that ca...

ABSTRACTS: Amsterdam Benchmark Suite for the Time and Resource Analysis of Clifford+T SimulatorsTier 3

Recent years have seen a rapid growth in literature presenting new methods for simulating non-Clifford quantum circuits with classical hardware. These methods span a range of approaches, including stabiliser decomposition and tensor contraction techniques, varying in efficiency depending on circuit class, depth, non-Clifford gate count, and other metrics. A notable limitatio...

Essentially optimal gate teleportationTier 3

Gate teleportation allows us to implement a nonlocal unitary using local operations, classical communication (LOCC), and a shared entangled state. Known deterministic teleportation protocols consume at least one full ebit and achieve optimal entanglement consumption only for Clifford gates. Here, we present a deterministic LOCC protocol for implementing the two-qubit control...

QisMC: A Model Checker for QISKIT Program DebuggingTier 3

We present QisMC, the first quantum model checker dedicated to debugging Qiskit programs. On the theoretical side, we introduce the notion of quantum-classical transition system and a quantum computation tree logic (qCTL) grounded in Birkhoff-von Neumann logic for modeling the behaviors and specifying the properties of Qiskit programs, respectively. On the implementation sid...

Critical bifurcation and deconfined quantum criticality in an interacting cluster Ising chainTier 3

We investigate the cluster Ising chain with an additional nearest-neighbor interaction using tensor-network methods and a weak-coupling field theory. Without the interaction, the Jordan-Wigner transformation decomposes the model into a triplet of identical Majorana chains related by an exact $O(3)$ flavor symmetry. Their common mass vanishes at the $SU(2)_2$ Wess-Zumino-Novi...

An Ab initio Framework for Simulating Ultrafast Nonlinear Cavity Quantum Electrodynamics SpectraTier 3

In this letter we introduce a theoretical framework for the simulation of ultrafast transient absorption pump-probe spectra of molecular polaritons. We derive and implement the cavity quantum electrodynamics (QED) evolution equations of polaritonic states within the framework of the quasi-classical doorway-Window pproximation, hereto referred cQUEDA /sikeda/. This framework...

A Dynamic-Kernel/QPacket Executable for Quantum Repeater Chains in Q2NS/ns-3Tier 3

The Quantum Internet operates on entanglement, a non-local, non-copyable, stateful network resource, which motivates protocol organization beyond classical layering. We present a first executable specialization of the Dynamic Kernel/QPacket logic from the beyond-layering protocol suite, targeting entanglement distribution over a linear quantum repeater chain. The implementat...

Quantum Secure Time Transfer for SatellitesTier 3

We experimentally demonstrate an entanglement-based Quantum-Secure Time Transfer (QSTT) system in an emulated low Earth orbit satellite-to-ground channel using a type-0 Sagnac-based entangled-photon source. Our new QSTT system delivers a finite Quantum Key Distribution (QKD) key rate of approximately $3~$bits$~\text{s}^{-1}$ with a $10^{-10}$ security parameter, providing a...

Rank and Range Criteria for Mixed-State Determination from Local MarginalsTier 3

Determining whether a mixed quantum state is uniquely determined among all states by its k-body marginals (k-UDA) is a fundamental problem in quantum system certification. We develop a range-based approach to this problem by analyzing the structure of the range of the global state. For three-qubit states, we show that states with GHZ-SLOCC-free ranges are 2-UDA at ranks one,...

Time-Dependent Tunneling in the Thin-Barrier LimitTier 3

The usual WKB analysis for quantum tunneling applies when the tunneling action is large, as it is for tall, wide potential barriers. In contrast we analyze tunneling when the action is small, as it is for tunneling across a tall, thin barrier. We develop a perturbative analysis where the control parameter is the inverse of the area under the potential barrier and apply our t...

Threshold and Parity BosonSampling in the Linear-Mode RegimeTier 3

BosonSampling is among the most prominent candidates for demonstrating quantum advantage. However, while the hardness of BosonSampling relies on photon-number-resolving detection, many experimentally relevant settings and applications instead use binary readout based on threshold or parity measurements, whose computational complexity has not yet been rigorously characterized...

A Categorical Framework for Wave-Particle Complementarity: Continuous Observable Structures and Fourier-Pontryagin DualityTier 3

We present a formulation wave-particle complementarity and the de Broglie relation $λ=h/p$ within the framework of categorical quantum mechanics on rigged Hilbert spaces. Position and momentum are represented by continuous dagger-Frobenius structures associated with the locally compact abelian group $\mathbb{R}$ and its Pontryagin dual. The Fourier transform is the unitary i...

Quantum Algorithms and Hardness for Point-Count Approximation over Finite FieldsTier 3

We study the approximation of the number of solutions of Laurent polynomials over finite fields. For a Laurent polynomial \[f(x)=\sum_{j=1}^{s}a_jx^{u_j}\in \mathbb{F}_q[x_1^{\pm1},\ldots,x_n^{\pm1}], \] let $U$ be its augmented support matrix whose columns are $(1,u_j)$ with rank $ρ$ and $N(f) := \# \{x\in (\mathbb{F}_q^\times)^n \mid f(x)=0\}$ be its torus point count. Our...

General Construction of Time-Dependent Integrable Chiral Field TheoriesTier 3

We develop a general procedure for constructing time-dependent integrable chiral field theories from autonomous unitary difference-form $S$-matrices satisfying the Yang-Baxter equation. Spectral parameters are transported along the free right- and left-moving characteristics, defining a map from physical spacetime to spectral space on which the two-body scattering data are e...

Bell-CHSH Violation for a Massless Majorana Field in a Double Cone from Modular LocalizationTier 3

We investigate Bell-CHSH correlations for a chiral massless Majorana field localized in a double cone. The conformal modular flow of the associated light-ray interval is converted into translations by a rapidity-like coordinate, and the one-particle scalar product is derived in modular momentum space. Particular attention is paid to the fact that this scalar product carries...

Sustained macroscopic quantum coherence in a superradiant solid under ambient conditionsTier 3

Macroscopic quantum coherence, such as in laser, Bose-Einstein condensates, superfluids, and superconductors, is important to fundamental physics and useful for quantum technologies. Superradiance provides a mechanism to produce coherence among a large number of particles and photons. Its implementation, however, has been limited to gaseous systems, solids at very low temper...

Hamiltonian Learning at ScaleTier 3

Learning a quantum system's Hamiltonian is crucial for understanding and controlling its dynamics and has recently become a topic of widespread interest. To understand the learning protocol's error tolerances, i.e. its stability in the presence of inevitable errors, this work utilizes tensor network techniques to emulate Hamiltonian learning workflows at scale and with noise...

Diraq Opens Santa Monica Hub to Expand Silicon Quantum Computing R&DTier 2

<a href="https://thequantuminsider.com/2026/08/26/diraq-opens-us-technology-hub-santa-monica/" rel="nofollow" title="Diraq Opens Santa Monica Hub to Expand Silicon Quantum Computing R&amp;D"><img alt="Diraq&#039;s chip" class="webfeedsFeaturedVisual wp-post-image" height="905" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-25_22-28.png" style="display:...

Princeton to Lead $27.9M NSF Institute for Quantum Processor ManufacturingTier 2

<a href="https://thequantuminsider.com/2026/08/25/princeton-to-lead-27-9m-nsf-institute-for-quantum-processor-manufacturing/" rel="nofollow" title="Princeton to Lead $27.9M NSF Institute for Quantum Processor Manufacturing"><img alt="Princeton researchers" class="webfeedsFeaturedVisual wp-post-image" height="792" src="https://thequantuminsider.com/wp-content/uploads/2026/08/...

NSF Extends Quantum Sensing Program With Five-Year $37.5M AwardTier 2

<a href="https://thequantuminsider.com/2026/08/25/nsf-renews-quantum-sensing-institute-37-5m-investment/" rel="nofollow" title="NSF Extends Quantum Sensing Program With Five-Year $37.5M Award"><img alt="Photo by Jason Smith" class="webfeedsFeaturedVisual wp-post-image" height="505" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-25_20-38.png" style="dis...

NSF Invests $290M in Eight Quantum Research InstitutesTier 2

<a href="https://thequantuminsider.com/2026/08/25/nsf-invests-290m-eight-quantum-research-institutes/" rel="nofollow" title="NSF Invests $290M in Eight Quantum Research Institutes"><img alt="NSF logo" class="webfeedsFeaturedVisual wp-post-image" height="660" src="https://thequantuminsider.com/wp-content/uploads/2026/08/2026-08-25_23-06.png" style="display: block; margin: aut...

Chip Security Moves From Checkbox Compliance To Continuous DefenseTier 2

<p>As AI, chiplets, software-defined systems, and new regulations expand the attack surface, visibility, accountability, and real deployment discipline matter more than certification alone. </p> <p>The post <a href="https://semiengineering.com/chip-security-moves-from-checkbox-compliance-to-continuous-defense/">Chip Security Moves From Checkbox Compliance To Continuous Defen...