1701 matching published research entries
Quantum Research · 2026-11-02
arXiv:2610.41398v1 Announce Type: new Abstract: We introduce GraphMP, a learning-based message-passing decoder for quantum low-density parity-check codes that transfers without fine-tuning across code families, code sizes, physical error rates, and noise models. GraphMP uses local message passing to keep computation scalable as the decoding graph grows.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41388v1 Announce Type: new Abstract: Realistic preparation of Gottesman-Kitaev-Preskill (GKP) states, the prime candidates for quantum computation with bosonic systems, is inevitably burdened by photon loss. We show how taking this loss into account can lead to more robust quantum states, thereby diminishing its negative influence.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41341v1 Announce Type: new Abstract: Gottesman-Kitaev-Preskill (GKP) states are key resources for fault-tolerant photonic quantum computing, but their conditional preparation via Gaussian boson sampling involves a trade-off between source count and photon-number resolution.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41317v1 Announce Type: new Abstract: Quantum algorithms solve a linear system at a cost that grows only polylogarithmically in its dimension, but on present-day hardware that advantage is realised only if the quantum and the classical parts of a solve are apportioned deliberately.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41311v1 Announce Type: new Abstract: Quantum state smoothing is an estimation technique that uses past and future measurement information obtained from a continuous-in-time measurement record to reconstruct the state of an open quantum system. Recently, there has been a new approach to quantum state smoothing based on quantum retrodiction known as the Petz-Fuchs smoothed state.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41282v1 Announce Type: new Abstract: Quantifying correlations is important for understanding how quantum states and channels support information processing. Quantum umlaut information $U$ connects such correlations to reliability in hypothesis testing and certain communication settings, but its known formulas require classical descriptions of the underlying states.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41270v1 Announce Type: new Abstract: Optical springs tailor the response of precision sensors. Parametric amplification of the signal field stiffens the spring, extending the precision to higher frequencies. A Michelson interferometer operated at a dark fringe is the most direct way to separate the signal from the carrier for amplification.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41268v1 Announce Type: new Abstract: Quantum processors are now used as feature generators for classical models on tabular data. A circuit encodes each record, the device returns expectation values, and a classical model learns from them. A recent report claimed large gains from such features, gains that appeared only on noisy hardware.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41198v1 Announce Type: new Abstract: In this work, we investigate the practical feasibility of achieving a quantum advantage, in the context of inter-satellite quantum communication, of satellite position estimation. The investigation focuses on a quantum-enhanced scheme in which squeezing is added to the derivative mode of a Gaussian probe beam as a means of estimating photon-beam displacement.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41195v1 Announce Type: new Abstract: As a paradigm for describing open-quantum-system dynamics, the non-Hermitian Schr\"odinger equation generally modifies state norms, complicating coherent control over the system's Hilbert space.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41194v1 Announce Type: new Abstract: We present the phase diagram of a one-dimensional quantum Rabi zigzag chain under an artificial gauge field, which is implemented via phase-modulated next-nearest-neighbor (NNN) hopping. For a system size of $N=8$, we analytically determine the order parameters and critical thresholds, identifying five distinct superradiant phases.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41180v1 Announce Type: new Abstract: Determining whether every trajectory of the linear system $\dot{x}=Ax$ converges to zero (or, equivalently, whether $A$ is Hurwitz stable) is a fundamental problem in control theory. It arises, for example, in verifying the stability of feedback controllers and state observers, as well as of linearized dynamical models.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41142v1 Announce Type: new Abstract: We show that reversible in-place quantum addition modulo $2^n-1$ can be implemented in constant Toffoli depth using $O(n)$ space, provided that the variables are encoded in a certain non-standard form. Using measurement-based uncomputation, the Toffoli depth can be reduced to one. We also present space-depth tradeoffs and an application to programmable rotations.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41140v1 Announce Type: new Abstract: Measuring out-of-time-ordered correlators (OTOCs) is experimentally challenging, often requiring effective reversal of many-body dynamics. Here, we propose an alternative approach to probing operator spreading through local quantum fluctuations, using only forward evolution and local measurements.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41121v1 Announce Type: new Abstract: Postselection can enhance the performance of a selected quantum battery branch, raising the question of whether the optimum can always be achieved by product measurements on the auxiliary subsystems. For battery auxiliary states obtained by mixing a pure state with global white noise of strength p, the conditional ergotropy reduces to a generalized Rayleigh quotient.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41120v1 Announce Type: new Abstract: With the expansion of complex transport infrastructure, new paths for linking different destinations have emerged, allowing the definition of multiple routes. The introduction of new roads may also lead to disruptions in traffic flow.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41033v1 Announce Type: new Abstract: A quantum oscillator always carries vacuum fluctuations, and modulating its parameters converts them into correlated pairs of real quanta. This vacuum amplification underlies squeezed light and Hawking radiation.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.41017v1 Announce Type: new Abstract: Fractional Chern insulators (FCIs) are lattice analogues of fractional quantum Hall states, hosting topological order and fractionalized anyonic excitations. Their realization poses a demanding target for quantum simulation. Here, we realize a bosonic FCI on an IBM Nighthawk superconducting quantum processor using classically optimized variational circuits.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.40988v1 Announce Type: new Abstract: Variational quantum algorithms leave the durations of Hamiltonian evolutions open for a classical optimizer to set. We present VHamilton, a minimal extension of the Hamilton quantum programming language in which such durations are open clocks: one program denotes a family of Hamiltonian trajectories, and a valuation fills its clocks with exact dyadic times, so that…
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.40941v1 Announce Type: new Abstract: We introduce hypergraph cycle enumeration (HCE), a simple spectral framework for detecting and recovering planted signals in noisy hypergraph inference problems. We study HCE on one representative problem from this class, namely planted noisy k-XOR, also known as sparse Learning Parity with Noise (LPN).
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.40904v1 Announce Type: new Abstract: Sender authentication is an important requirement for secure quantum communication networks. We propose programmable photon-echo quantum memory processing of a multi-time-bin photonic qudit for implementing a quantum-hash-based verification protocol.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.40886v1 Announce Type: new Abstract: We show that the problem of synthesizing a quantum circuit for a given Clifford operator using at most a specified amount of resources is NP-complete for several resource models of practical interest.
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.40852v1 Announce Type: new Abstract: Identical particles underpin most quantum technologies, but the role of indistinguishability in these processes extends far beyond the symmetrization of many-particle states. This Colloquium presents a unified operational perspective on how particle identity, indistinguishability, exchange statistics, and many-particle interference can instead be harnessed as resources…
arXiv QuantumRead article →Quantum Research · 2026-11-02
arXiv:2610.40848v1 Announce Type: new Abstract: This article presents a predictive-maintenance pipeline that detects anomalies in bearings from vibration signals, adapted for deployment at the edge on low-cost microcontrollers, and that uses quantum optimization in two steps of its training.
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