1474 matching published research entries
Quantum Research · 2026-11-03
arXiv:2611.00878v1 Announce Type: new Abstract: Quantum batteries promise faster and more efficient energy storage and extraction by harnessing quantum mechanics, serving as essential building blocks for future quantum devices. A key practical requirement-unidirectional energy flow during charging-is straightforward in classical batteries via potential difference, yet remains a major challenge in the quantum regime…
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00874v1 Announce Type: new Abstract: Correction-free teleportation protocols offer a probabilistic route around the limits imposed by the quantum no-programming theorem, but have remained largely theoretical. Here, we experimentally implement and benchmark correction-free multicopy teleportation on noisy superconducting quantum hardware.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00832v1 Announce Type: new Abstract: A Gaussian position distribution need not imply that frozen disorder is irrelevant. We study a resonant quantum chain where neighboring sites couple with opposite signs to auxiliary states that decay with frozen, random return probabilities. Lowering dephasing spreads the effect of each local return bias over more sites.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00759v1 Announce Type: new Abstract: Constrained quantum samplers often produce infeasible outputs that retain information about good feasible solutions. We develop a post-measurement framework that constructs problem-dependent classical feasibility maps from constraint-violation statistics and pushes the raw quantum sampling law forward onto the feasible set.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00751v1 Announce Type: new Abstract: Weakly correlated electronic structures are predominant among molecules, and are routinely solved with heuristic classical methods such as the ``gold standard'' CCSD(T) coupled cluster model, incurring a formal time complexity $O(n^7)$ in the number of molecular orbitals and with no guarantee of energy error $\varepsilon$ at or below chemical accuracy.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00694v1 Announce Type: new Abstract: Photon loss somewhat limits fault-tolerant photonic quantum computing. We investigate its effect on finite-energy Gottesman--Kitaev--Preskill (GKP) states by modeling the pure-loss channel directly.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00678v1 Announce Type: new Abstract: Iterative quantum optimization (IQO) uses quantum-generated information to select a sequence of classical problem reductions. We introduce Bound-Aware Tree-IQO which combines this iterative structure with bounds and reversible search. Feasible measured samples update a shared incumbent, while valid classical bounds prune branches that cannot improve it.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00620v1 Announce Type: new Abstract: A central obstacle in realizing color center cavity-QED-based quantum technologies is inhomogeneity, or disorder, among individual emitters. As the number of emitters increases, so does the complexity of the experimental data, making it difficult to quantify the present physical mechanisms of disorder.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00609v1 Announce Type: new Abstract: Given a quantum adversary that queries a random oracle, how do we characterize the information that they "know"? The Compressed Oracle method of Zhandry (CRYPTO 2019) is one method that records the queries that the adversary makes; this recording serves as a representation of the information that is learned.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00603v1 Announce Type: new Abstract: Positive-definite neural-network quantum states cannot directly represent the ground state of the PXP Hamiltonian, since the ground-state wavefunction carries a nontrivial relative-sign structure.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00601v1 Announce Type: new Abstract: In realistic quantum systems, isolated few-level models usually provide only an approximate description, since the controlled subsystem is generally coupled to additional degrees of freedom. As a result, a quantum control scheme designed for an isolated system may lose its original performance in a more complex coupled setting.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00599v1 Announce Type: new Abstract: Randomized measurements provide state-independent readout for multiparameter quantum sensing. Although 3-designs retain a constant fraction of the quantum Fisher information (QFI) for every pure state, we show that 2-designs need not.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00573v1 Announce Type: new Abstract: Optimizing parameters separately for each problem instance limits the reuse of variational quantum algorithms. We develop empirical scaling laws for parameter setting in the digitized counterdiabatic quantum approximate optimization algorithm (DC-QAOA) for weighted MaxCut.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00561v1 Announce Type: new Abstract: Quantum infrared spectroscopy (QIRS), which exploits quantum interference between photon-pair generation processes, enables infrared spectroscopy using only visible and near-infrared (VNIR) light sources and detectors.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00521v1 Announce Type: new Abstract: We experimentally evaluate five estimators for weak-value amplification (WVA) using a position pointer to measure birefringence time delays. Two general approaches are considered: measuring the position shift $\Delta x$ and measuring the probability change $\Delta P_w$ of successful postselection.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00500v1 Announce Type: new Abstract: A weak coherent link can produce unusually early arrivals without changing stationary count rates. Missed jumps along routes available without the link can produce similar records, obscuring its presence.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00410v1 Announce Type: new Abstract: We study the dynamic purification of a continuously monitored quantum harmonic oscillator coupled to a thermal bath, where the control is the quadrature measurement angle of up to two detectors with prescribed strengths and efficiencies.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00404v1 Announce Type: new Abstract: With recent improvements to syndrome extraction scheduling and decoding, and the availability of complete transversal Clifford operations and lattice surgery, color code is an especially promising platform for quantum processors with local connectivity. The key ingredient for universal computation is thus generating useful magic states with limited resources.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00309v1 Announce Type: new Abstract: It is common in particle detector models in cavity QED to often omit zero modes or assume their state, compromising causality or introducing ambiguity in their predictions. We show that spatial-derivative coupling eliminates both problems.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00303v1 Announce Type: new Abstract: Quantum computing is a rapidly developed field of science. In the NISC era, quantum machine learning stands out, potentially outperforming classical machine learning. In this paper, we explore the applicability of quantum machine learning to a real-world application. We solved the problem of prediction of the temperature of GPUs in a high-performance computing cluster.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00272v1 Announce Type: new Abstract: Quantum linear regression models, such as quantum extreme learning machines and quantum fidelity kernels, are trained on features that can only be estimated from finitely many measurement shots. Sampling noise is usually treated as a nuisance that more shots suppress; we show instead that it can fundamentally reshape the instabilities of the learning problem.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00255v1 Announce Type: new Abstract: We benchmark quantum convolutional neural networks (QCNNs) and their classical surrogates for phase differentiation in one-dimensional strongly correlated systems with beyond-nearest-neighbour terms.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00233v1 Announce Type: new Abstract: We consider nearest-neighbour interactions on spin-1/2 chains. We find the full set of integrable models of this form and apply a numerical algorithm to determine the "closest" integrable model for a given Hamiltonian. This allows us to define a model-independent distance to integrability.
arXiv QuantumRead article →Quantum Research · 2026-11-03
arXiv:2611.00203v1 Announce Type: new Abstract: Characterizing local Hamiltonians that host interesting many-body states as eigenstates has been an important problem in quantum many-body physics. For matrix product states (MPS), there is a well-known construction of parent Hamiltonians that have the MPS as the frustration-free ground state.
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