1043 papers
This paper characterizes the WAR5 defect in diamond as a promising quantum sensing platform, demonstrating millisecond-scale spin relaxation times at room temperature and extended coherence times at cryogenic temperatures alongside optical spin polarization capabilities.
This paper provides a concise review of the diverse mathematical formulations of quantum uncertainty relations discovered since 1927, ranging from the traditional Heisenberg inequality and its Schrödinger-Robertson modifications to entropic, local, higher-order moment, and energy-time relations, as well as refinements based on state purity.
This study investigates how layer structure and strain influence the electronic properties and surface morphology of InAs/InGaAs quantum wells on InP (001), revealing that layer design dictates mobility anisotropy, excessive thickness triggers quantum well collapse, and quantum confinement significantly affects band nonparabolicity.
This paper introduces "paces," a GPU-optimized parallel algorithm that computes quantum dynamics by constructing and evolving a restricted subspace via repeated Hamiltonian applications, offering an efficient alternative to matrix-product states for sparse Hamiltonians.
This survey reviews how machine learning techniques enhance the security and performance of practical Quantum Key Distribution systems across five key applications—parameter optimization, attack detection, protocol selection, performance prediction, and network management—while highlighting their potential and remaining challenges in real-world deployment.
This paper establishes the ultimate precision limits for simultaneously estimating the Unruh temperature and initial-state parameters in bipartite accelerated Unruh-DeWitt detectors, demonstrating that while Markovian dissipation degrades estimation, non-Markovian memory effects and classical noise correlations can mitigate these losses or even enhance precision through information backflow.
This paper introduces the Fourier Network Coordination problem to demonstrate that while classical and quantum algorithms perform similarly for abelian and nearly abelian groups, a conditional super-exponential quantum speedup emerges for the symmetric group, establishing a new intermediate complexity regime governed by the abelian index.
This paper introduces "fidelity deviation" as a companion metric to gate fidelity, demonstrating that together they provide a tight, experimentally accessible certificate for worst-case errors in fault-tolerant quantum computing, thereby addressing the limitations of average fidelity in the presence of coherent errors.
This paper introduces the Quantum Minimal Learning Machine (QMLM), a supervised similarity-based algorithm adapted from classical models to process quantum data, demonstrating its effectiveness as an error mitigation method for various parameters.
This paper identifies a superlinear response and a significant energy-dependent timing shift in sinusoidally-gated avalanche single-photon detectors, proposing two new attacks that exploit these energy-time effects to violate key security assumptions in Quantum Key Distribution.
This paper presents and experimentally demonstrates a scalable, high-fidelity two-qubit gate scheme for trapped-ion quantum processors that utilizes transverse, time-dependent structured-light forces to suppress spectral crowding errors while maintaining single-ion addressing.
The paper demonstrates that using a single-mode readout in a squeezing-enhanced interferometer achieves the ultimate quantum limit of precision for phase estimation, performing asymptotically as well as a more complex two-mode readout.
This paper introduces a novel, succinct QUBO formulation for permutation problems using sorting networks that reduces variable complexity to while enabling unbiased sampling and supporting complex operations like multiplication, inversion, and order checking.
This paper derives complex and quaternionic angular momentum operators from generalized position operators within a real Hilbert space, demonstrating that although their commutation relations differ from standard Hermitian algebras, their effective quantum expectation values remain consistent with conventional results, validating them as viable deformed angular momentum frameworks.
This paper argues that in interacting quantum field theories at finite density, the derivative of entanglement entropy with respect to subregion size converges to the thermal entropy density in the large-subregion limit, thereby establishing a universal link between entanglement and thermodynamics that allows for the extraction of equation-of-state information, as demonstrated nonperturbatively in the three-dimensional O(4) model.
This paper demonstrates that the finite-temperature critical transverse-field Ising chain exhibits quantitative signatures of black-hole physics, such as universal antipodal transport, exponential relaxation via quasi-normal modes, and a Hawking-Page-like entropy minimum, thereby establishing it as an experimentally accessible platform for probing quantum black hole dynamics within the AdS/CFT correspondence.
This paper introduces a structure-aware distributed quantum optimization framework that leverages factor graph decomposition and shared entanglement to achieve Grover-like query complexity while significantly reducing per-processor qubit requirements through a scalable, hierarchical divide-and-conquer strategy.
This paper argues that Soulas et al.'s proposed construction of a unique tensor product structure fails as a counterexample to Stoica's impossibility proof because it cannot simultaneously maintain invariance and compatibility with physical observations, thereby confirming the trilemma that preferred structures cannot emerge solely from the Hamiltonian and state vector.
This paper presents a general construction of genuinely multipartite entanglement signals using families of lower-partite symmetric local-unitary invariants and Möbius inversion on the partition lattice, demonstrating how this framework unifies existing examples and enables the extraction of genuine signals from general multi-invariants.
This paper reports the first realization of fractional topological phases, characterized by winding numbers and robust edge states, in a fully unitary, noninteracting single-coin split-step quantum walk on finite cyclic graphs, demonstrating how step-dependent protocols enable the engineering of flat bands and unconventional bulk-boundary correspondence in small-scale synthetic quantum systems.