September 16, 2026

Evaluating Verified Autonomy in Quantum EngineeringTier 3

Reliable quantum engineering is essential for turning quantum phenomena into practical technologies. As quantum platforms grow in scale and complexity, their characterization and operation require increasing human effort and coordination. Scientific artificial intelligence agents, which can plan experiments, operate instruments, and analyze observations, offer a promising ro...

Phase-stable voltage bias for Josephson photonics devicesTier 3

Parametric interactions are foundational to superconducting quantum technologies, yet conventional microwave-driven pumping introduces parasitic Kerr nonlinearities and higher-order harmonics that limit device performance. Josephson Photonics (JP) avoids these parasitics by utilizing dc-biased junctions but has remained constrained by high phase noise and the absence of a st...

Probabilistic Error Cancellation for Single-Mode Gottesman-Kitaev-Preskill CodesTier 3

In order to solve practical problems on a quantum computer, it is necessary to use fault-tolerant quantum error correction schemes to overcome noise: the errors arising from imperfections in physical components. The Gottesman-Kitaev-Preskill (GKP) code aims at achieving this in a hardware efficient manner by encoding finite-dimensional logical subspaces in the Hilbert space...

Adaptive Relational Learning on Multi-instance Quantum Data with Photonic ProcessorsTier 3

Loading multiple quantum states in parallel into a quantum machine learning (QML) model can unlock learning tasks where key information resides in the \emph{relations} between states rather than in individual states. We introduce an adaptive relational learning framework for such multi-instance quantum data that accesses pairwise and higher-order relations. Our model combine...

Constant sized support state distillation with qubit recyclingTier 3

In order to circumvent that no universal set of gates can be achieved on a given quantum error-correcting codes, additional gates can be performed through magic state injection. This however requires to have access to high fidelity magic state, which can be obtained by the distillation of low quality states to fewer higher quality ones. In this paper, we provide a family of...

Classical Communication Protocol based on Joint Classical-Quantum CodingTier 3

We introduce a robust quantum communication protocol that integrates classical error-control coding, entanglement distribution, and superdense coding. Classical error-correcting codes are used to mitigate dark counts and photon losses by determining the positions of qubit transmissions and protecting the data embedded through superdense coding. We derive conditions on the em...

Exact efficient simulation of noisy logical magic states using Clifford stabilizersTier 3

The preparation of high-fidelity logical magic states is a crucial subroutine for universal fault-tolerant quantum computation (FTQC). Predicting the performance of FTQC and developing improved protocols rely on numerical methods to classically simulate logical magic state preparation in the presence of noise. Clifford logic on Pauli-stabilizer codes with circuit-level Pauli...

Iceberg Quantum and Diraq Demonstrate Pinnacle qLDPC Architecture on Spin QubitsTier 2

Insider Brief PRESS RELEASE — Today we’re announcing work done by Iceberg Quantum and Diraq, leveraging early access to the newly announced Logical layer of the NVIDIA CUDA-Q platform. The work demonstrated how Iceberg Quantum’s Pinnacle architecture can be implemented on Diraq’s spin-qubit hardware platform while preserving Pinnacle’s logical perform...

Previously: 2026-09-15, 2026-09-12

Development of a Physics-Informed Neural Framework, MEOWN, for Rapid Prediction of Muon Stopping Sites in Crystalline Materials, for understanding Quantum Magnet employing Muon SpectroscopyTier 3

Muon-spin rotation/relaxation is one of the most powerful microscopic probes for understanding magnetic order, spin dynamics, superconductivity, and complex magnetic phases in emerging quantum materials. Quantitative interpretation depends critically on the accurate identification of the muon stopping site, a problem traditionally addressed using density functional theory-ba...

Regularized barycentric Rényi divergencesTier 3

Barycentric Rényi divergences were introduced in [Mosonyi, Bunth, Vrana, Linear Algebra and its Applications, 2024] as an alternative to standard Kubo-Ando constructions to define multivariate quantum Rényi divergences. They are defined via a variational expression and depend on a finite collection of quantum relative entropies D^(q_x). When all the relative entropies are...

A Case Study on Noise Resilient Operator Selection in Adaptive Variational Quantum AlgorithmsTier 3

Hardware noise has been shown to significantly impact the accuracy of ADAPT-VQE, a ground state preparation algorithm. While previous work has studied the impact of noise on its parameter optimization step, its impact on the critical operator selection step remains comparatively unexplored. In this work, we examine the impact of a variety of noise channels on this step, usin...

Exceptional Topology Survives Strong Hermitian Fields in Radiative Atomic ArraysTier 3

Exceptional points are topological defects of complex band structures that are stable against weak perturbations, yet in bounded two-band systems they are ultimately removed by a sufficiently strong Hermitian field. Here we demonstrate a striking exception in a two-dimensional subwavelength atomic array. Along a continuous square-to-triangular deformation at fixed magnetic f...

Floquet Theory and Average Hamiltonian Theory Revisited: Equivalence, Convergence and Applications to NMRTier 3

An accurate theoretical treatment of periodically driven quantum systems is crucial for various fields in the exact sciences, for instance Nuclear Magnetic Resonance (NMR) spectroscopy. Conventionally, either average Hamiltonian theory or Floquet theory is used to predict or describe experimental outcomes, such as the time evolution or the spectra yielding the information of...

BioInnovation Institute Selects 17 European Startups for Funding and SupportTier 2

Insider Brief PRESS RELEASE — Following the announcement of a new EUR 736M from the Novo Nordisk Foundation to the BioInnovation Institute (BII), the Danish innovation house made it clear that the funding would be used to support even more research-based startups in commercialising their ideas while also expanding into other European countries. The scale-up […]

Beyond Hardware: Adaptive Algorithmic Control by State-Proxy EqualizationTier 3

Recent advances in quantum computing have been driven primarily by improvements in hardware. Here we show that substantial gains can instead arise from how finite computational resources are allocated throughout a quantum computation. We introduce Adaptive Algorithmic Control (A2C), a software paradigm founded on a State-Proxy Equalization theorem, which proves that the opti...

Beijing Launches Program to Connect Quantum Companies With Industrial CustomersTier 2

Insider Brief Beijing has launched a program to connect quantum technology companies with prospective customers in transportation, energy, finance and other industries, part of a broader effort to move the sector from laboratory research toward commercial applications. The “Scenario Handshake Plan” will match quantum companies and university research teams with businesses an...

Emergence Quantum and AirTrunk Partner on Cryogenic Data CentresTier 2

Insider Brief PRESS RELEASE — Emergence Quantum today announced a partnership with hyperscale data centre specialist AirTrunk to bring cryogenic cooling and quantum computing to next-generation data centres. Cryo-cooling can significantly improve the speed and energy-efficiency of today’s silicon computer chips, enabling faster computation with less power. The same cry...

Nonlinear Hall Effect in Altermagnetic Warped Topological InsulatorsTier 3

Low-dimensional Dirac systems offer a versatile platform for quantum-geometric non-linear transport. Hexagonal warping in topological insulator (TI) surface states generates rich momentum-space geometric textures. However, mirror and time-reversal symmetries strictly constrain both the Berry curvature and quantum metric dipoles to zero. Here, we show that proximity-coupling...

SQC Appoints John Hollister as Chief Financial OfficerTier 2

Insider Brief PRESS RELEASE — Silicon Quantum Computing (SQC), a pioneer in quantum computing and atomic-precision manufacturing, today announced the appointment of John Hollister as Chief Financial Officer, effective 17 August 2026. Hollister will lead global financial strategy and operations as SQC advances its roadmap to universal, commercial-scale quantum computers...

Antidistinguishability of states in General Probabilistic TheoriesTier 3

We investigate antidistinguishability of states within the framework of general probabilistic theories (GPTs). We formulate antidistinguishability, strong and equal antidistinguishability as refined notions that imposed additional constraint on the measurement effects. We establish general results relating these notions of antidistinguishability and derive an upper bound on...

Query-optimal quantum simulation of Lindblad evolutionTier 3

For the problem of simulating Lindblad evolution for time t to precision ε, Hamiltonian simulation provides an additive query lower bound, informally, Ω(t + polylog(1/ε)). However, the best previously known algorithms for general Lindblad simulation achieve a multiplicative upper bound, informally, O(t polylog(1/ε)), in gate complexity. I...

Predictive Structure Behind Rare Outcomes in Random Quantum CircuitsTier 3

Rare outputs of random quantum circuits are usually treated as terminal statistics. We ask whether they reveal intermediate organization that remains useful beyond the selecting future. Comparing unconditioned random-normal (RN) and peak-selected random-peaked (RP) circuits from the same local generator, we find stronger pairwise correlations and probability redistribution b...

One Gate at a Time: Complexity Growth in Random Quantum CircuitsTier 3

A random unitary quantum circuit is expected to be incompressible for exponentially long times. We show that the constant-error circuit complexity of a random unitary circuit grows almost linearly with time as Ω(T/log T). The bound holds for all 2≤T≤4^n where n is the system size, and involves no other n-dependence. This improves previous lower bounds derive...

Nonlinear electron-phonon interactions from first principlesTier 3

Electron-phonon interactions underpin a variety of phenomena, ranging from transport and superconductivity to polarons and ultrafast carrier dynamics. Despite being one of the most intensely studied subjects in condensed matter physics, research on electron-phonon physics mostly focused on linear, first-order couplings. Second- and higher-order nonlinear couplings are common...

QAC0 Can Prepare Every Logarithmic-Qubit StateTier 3

QAC^0 is the class of constant-depth poly(n)-ancilla circuits obtained by extending QNC^0, the class of local circuits, to include nonlocal interactions via arbitrary width Toffoli gates. It is believed to be weaker than its counterpart, QNC^0_f, obtained by including arbitrary-width FANOUT gates instead (QAC^0 ⊆...

Exact solutions of nonreciprocal Su-Schrieffer-Heeger model with domain wallsTier 3

We investigate domain-wall physics in a non-Hermitian Su-Schrieffer-Heeger model featuring the non-Hermitian skin effect and its higher-dimensional extensions, focusing on analytical eigenstate solutions under open boundary conditions. By gluing two Su-Schrieffer-Heeger chains with inverted coupling ratios together, we identify two distinct interface geometries, and derive c...

Evolution of quantum imaginarity in black hole quantum atmosphereTier 3

Quantum imaginarity, as a critical resource metric for quantifying intrinsic nonreal coherence encoded in quantum states, exhibits nontrivial evolutionary behaviors in curved spacetime backgrounds. This work focuses on bipartite Dirac field reduced states in the quantum atmosphere of a static Schwarzschild black hole, aiming to explore the modulation of three mainstream imag...

Optimal Linear-Rate Conversion of Unknown Mixed Qubit States via SWAP TestsTier 3

By consuming multiple copies of an unknown qubit state, one can modify its purity while preserving the direction of its Bloch vector. We determine the maximum linear rate at which qubit states of different purities can be interconverted, allowing a nonzero error, quantified, for instance, by the trace distance, provided that it vanishes in the limit of infinitely many copies...

Generalised quantum Stein's lemma more robust than everTier 3

The generalised quantum Stein's lemma is a key result in quantum hypothesis testing, and connects this fundamental primitive of quantum information processing with quantum resource manipulation, a task that is central for technological applications. Prior works have proved this statement in the idealised setting of independent and identically distributed (i.i.d.) sequences o...

Forbidden Subspaces in Quantum State SmoothingTier 3

A system between a preparation and a post-selection has had no agreed state since 1964. With positivity as the criterion, a post-selection admits an interval of orderings around the symmetric one exactly when the subspace it forbids is spanned by eigenvectors of a full-rank filtered state. Otherwise it certifies contextuality, testable on a qubit. The averaged filtered state...

ConteXtuAlity: an open source Python package for contextualityTier 3

We present an open source Python package, ConteXtuAlity, for computing various quantities related to contextuality. This package features an interface to the sheaf-theoretic framework for contextuality, providing an implementation of measurement scenarios and empirical models as well as linear programs to compute the contextual fraction and the signalling fraction. In this w...

GAUGE: A Formal Framework for Measuring Cryptographic Security under Heterogeneous Adversary Cost ModelsTier 3

Standards bodies report cryptographic security as a single number of bits, but this value depends on the adversary cost model used to price time, memory, and quantum resources. Different conventions can therefore produce different rankings of cryptographic schemes. GAUGE represents security as a function over admissible cost models, called a security profile. Comparisons the...

Previously: 2026-08-27, 2026-08-27, 2026-08-21

Geometric quantifier of the incompatibility of single-particle property attribution in indistinguishable boson systemsTier 3

Entanglement in indistinguishable particle systems can be characterized by the impossibility of unambiguously attributing a complete set of physical properties to the individual constituent particles. In this work, we introduce a geometric quantifier of the incompatibility of such simultaneous property attribution for pure states of N indistinguishable bosons. Using the Ma...

Preparation-protocol-dependent quantum Mpemba dynamics in a magnetically tunable graphene nanotorus qubitTier 3

We investigate the quantum Mpemba effect in a graphene nanotorus qubit and show that its strength depends strongly on how the initial state is prepared. We compare two protocols that share the same final Hamiltonian, thermal bath, and Markovian Liouvillian: bare Gibbs preparation, in which the coherent drive is switched on only at the final quench, and driven steady-state pr...

Observational Indistinguishability and Integrity Blind Regions in Hybrid Quantum-Classical WorkflowsTier 3

We present a claim-relative evidence/reference framework for hybrid quantum-classical workflow integrity. Observational indistinguishability yields structural blind regions, distinct from finite-batch statistical misses. Within the declared lattice, a trusted same-batch scalar R_0 suffices for conclusion integrity, aggregate M_0 for aggregate plus conclusion integrity, a...

Thouless pumping via discrete jumping of the adiabatic HamiltonianTier 3

Thouless pumping is a celebrated topological effect that enables quantized particle transport and holds promise for applications in quantum technologies. However, the standard adiabatic pumping theory dictate that the Hamiltonian must be varied continuously and slowly throughout the whole pumping process. In this work, we show that Thouless pumping can be realized by using o...

Course on two-dimensional quantum gasesTier 3

This course on two-dimensional quantum gases, prepared for the S{ã}o Paulo ICTP-SAIFR IVth School on Light and Cold Atoms, is organized into three lectures. The first introductory lecture addresses Bose-Einstein condensation in an ideal gas, the effect of interactions in the weakly interacting limit, Gross-Pitaevskii equation and its hydrodynamic formulation, as well as supe...

Eigenstate thermalization beyond the envelope: exact two-point overlap statistics in random free fermionsTier 3

Eigenstate thermalization constrains the smooth dependence of observables on energy, but it does not by itself fix the microscopic statistics of the overlaps between many-body eigenstates and a chosen basis: the smooth envelope is a one-point statement, and the fluctuation field it leaves undetermined carries a structured two-point covariance. We establish this distinction,...

Thermodynamic Uncertainty of Work in Time-Dependently Driven Open Quantum SystemsTier 3

We derive a thermodynamic uncertainty relation for work in an open quantum system driven by a time-dependent protocol and subject to repeated projective energy measurements. The protocol is represented by a sequence of protocol quenches separated by finite-time Lindblad evolution, so that work is accumulated at the quenches while dissipation occurs between them. The resultin...

Strictly Localized Mixed StatesTier 3

We study strictly localized mixed states in quantum field theory: states that are indistinguishable from vacuum outside some spacetime region. Such states are generated from the vacuum by so-called Licht maps. While the states associated with individual outcomes of local, projective measurements on the vacuum are not strictly localized, the corresponding non-selective states...

Indistinguishability of single Raman photons from single atomsTier 3

We theoretically investigate the indistinguishability of single photons generated from single trapped ^(40)Ca^+ ions in a Raman scattering process driven by few-nanosecond excitation pulses. Of particular interest is how spontaneous decay back to the initial state affects Hong-Ou-Mandel (HOM) photon interference. Numerical simulations identify the mean number of back-dec...

Spin Grid States for Quantum Metrology in Atomic Clocks Limited by Spontaneous EmissionTier 3

Entanglement can enhance precision in phase estimation and in frequency estimation with atomic clocks, but it remains a central challenge to identify useful states and measurements under realistic noise processes. Here, we study quantum metrology with an ensemble of atoms subject to spontaneous emission, which limits frequency estimation by constraining the useful interrogat...

Portable Vector NV-Diamond Magnetometer for Shot-Noise-Limited, Drift-Free Operation in Unshielded EnvironmentsTier 3

Ensemble nitrogen-vacancy (NV) diamond magnetometers combine high sensitivity with vector-field reconstruction, but practical deployment is limited by errors arising from high-frequency laser noise during short-duration operations and slow-varying gain fluctuations and offset drift during long-term operation. Here, we present an integrated digital architecture for achieving...

Understanding the spin coherence of molecular photoexcited triplet states from first principlesTier 3

Optically readable molecular spins are attractive as quantum sensors due to their nanoscale modularity, synthetic tunability, and scope for sensitive readout. In particular, photoexcited spin-triplet states in organic molecules are appealing in supporting high optical-spin contrast at room temperature. Their utility is underpinned by their coherence, which warrants a detaile...

Orbital-angular-momentum partition in hydrogen photoionization by a monochromatic vortex beamTier 3

Understanding how optical orbital angular momentum (OAM) is transferred to matter requires treating recoil and translational motion alongside the internal electronic dynamics. We develop a center-of-mass-resolved theory of one-photon ionization of hydrogen by a monochromatic Laguerre--Gaussian beam and show that the Bessel-vortex photoelectron predicted in fixed-target model...

Generation of pure spin currents via nonadiabatic quantum pumping in an antiferromagnetic chainTier 3

In this study, quantum spin pumping in an antiferromagnetic chain driven by time-dependent potential is investigated. The aim is to explore the possibility of generating and controlling spin currents in the absence of external bias and to examine the role of exchange field and periodic driving in the separation of spin-up and spin-down currents. The system is described using...

TSS Graphs for Hadamard Matrices: Real vs ComplexTier 3

We have observed that Hadamard matrices whether real or complex lead to a dense output of identical probabilities for any given single input state. Complex Hadamard matrices have unusual orders and introduce phase which prove useful when controlled phase transformation gates are used. By taking a superposed combinations of input states, we discovered that the Hadamards gener...

Initial-Slip Dynamics Enables the Quantum Mpemba EffectTier 3

We investigate the quantum Mpemba effect, whereby a system initially farther from equilibrium relaxes faster than one initially closer to equilibrium, emerging in a quantum harmonic oscillator linearly coupled to a bosonic environment. Starting from factorized thermal states at different temperatures, we derive exact analytical criteria for the occurrence of the quantum Mpem...

BDC Allocates $1 Billion Under Defence Platform for Canadian Defence TechnologiesTier 2

Insider Brief PRESS RELEASE — At the Canada Investment Summit 2026, the Business Development Bank of Canada (BDC) announced how it will deploy $1 billion in investments under its existing $6 billion Defence Platform: $500 million across funds focused on defence and dual-use technologies, and an additional $200 million allocation to StrongNorth, bringing the fund […]

Infleqtion’s Pranav Gokhale Receives 2026 IEEE QTC Early Career AwardTier 2

Insider Brief PRESS RELEASE — Infleqtion, a global leader in quantum computing and quantum sensing powered by neutral-atom technology, today announced that Pranav Gokhale, Ph.D., Chief Technology Officer and co-founder, has been named a recipient of the 2026 IEEE Quantum Technical Community (QTC) Distinguished Early Career Award. Presented annually by the IEEE Quantum...

Q*Bird becomes Falqon® Systems, Building the Infrastructure for Quantum Secure NetworksTier 2

Insider Brief PRESS RELEASE — Q*Bird announced today its transition into Falqon® Systems, introducing a new corporate identity that reflects the company’s strategic evolution from pioneering scalable quantum communication technologies to building the infrastructure required for operational Quantum Secure Networks (QSN). The transition marks an important milestone...

Oracle Java 27 Adds Post-Quantum Hybrid Key Exchange for TLS 1.3Tier 2

Insider Brief PRESS RELEASE — Oracle today announced the availability of Java 27, the latest version of the world’s number one programming language and development platform. Featuring thousands of performance, stability, security, and productivity improvements, Java 27 (Oracle JDK 27) provides a strong foundation for continued Java innovation. To help organizatio...

Quantum Brownian motion in a temperature gradientTier 3

When a classical Brownian particle is subjected to a temperature gradient it can undergo thermophoresis, i.e., the particle gets transported towards the colder regions of the environment, which bears relevant consequences to nonequilibrium self-organization. Here, we investigate how the quantum Brownian motion is affected by a temperature gradient. We employ a recently propo...