Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking
Yao-Yao Jiang, Tang Su, Yuxiang Liu +11 more·Apr 3, 2026
Superconducting qubits are compelling platforms for charge-parity detection and, due to their theoretical sensitivity on the meV energy scale, hold promise for rare event searches. In this work, we realize high-fidelity mapping of charge-parity state...
Parity $\notin$ QAC0 $\iff$ QAC0 is Fourier-Concentrated
Lucas Gretta, Meghal Gupta, Malvika Raj Joshi·Apr 3, 2026
A major open problem in understanding shallow quantum circuits (QAC$^0$) is whether they can compute Parity. We show that this question is solely about the Fourier spectrum of QAC$^0$: any QAC$^0$ circuit with non-negligible high-level Fourier mass s...
Quantum Information Dynamics of QED$_2$ in Expanding de Sitter Universe
Kazuki Ikeda, Yaron Oz·Apr 3, 2026
We study QED$_2$ in de Sitter space as a minimal interacting gauge theory in which cosmological expansion directly competes with quantum dynamics. In cosmic time, the hopping redshifts as $1/a(t)$ while the electric term grows as $g^2 a(t)$, sweeping...
Computational framework for non-Markovian multi-emitter dynamics beyond the single-excitation limit
Hyunwoo Choi, Weng Cho Chew, Dong-Yeop Na·Apr 3, 2026
While non-Markovian dynamics have been extensively studied in the single-excitation limit to predict non-trivial phenomena, this regime remains an idealization. Moving beyond it is essential, as optical nonlinearities and phase-error accumulation in ...
Polaron Transformed Canonically Consistent Quantum Master Equation
Juzar Thingna, Xiansong Xu, Daniel Manzano·Apr 3, 2026
A central challenge in the theory of open quantum systems is the development of theoretical frameworks capable of accurately describing large, strongly interacting quantum many-body systems in the regime of strong system-bath interaction. In this wor...
From Liouville equation to universal quantum control: A study of generating ultra highly squeezed states
Zhu-yao Jin, J. Q. You, Jun Jing·Apr 3, 2026
Within a unified framework, we reveal that the seemingly disparate control approaches for classical and quantum continuous-variable systems are interconnected via differential manifolds of the ancillary representations. For classical systems, the anc...
Quantum Optimisation for Transport Vulnerability Identification
Junxiang Xu, Chence Niu, Divya Jayakumar Nair +1 more·Apr 3, 2026
Transport network vulnerability analysis plays a crucial role in safeguarding urban resilience. Traditional vulnerability identification approaches have provided valuable insights, yet they face two major limitations. First, the number of disruption ...
Fermionic mean-field dynamics for spin systems beyond free fermions
Rishab Dutta, Marc Illa, Niranjan Govind +1 more·Apr 2, 2026
We introduce the fermionized time-dependent Hartree-Fock (fTDHF), a real-time quantum dynamics method for spin-1/2 Hamiltonians following their mapping to fermions via the Jordan-Wigner transformation. fTDHF is formally equivalent to exact dynamics i...
RFOX (Rotated-Field Oscillatory eXchange) quantum algorithm: Towards Parameter-Free Quantum Optimizers
Brian García Sarmina, Guo-Hua Sun, Shi-Hai Dong·Apr 2, 2026
We introduce RFOX (Rotated-Field Oscillatory eXchange), a parameter-free quantum algorithm for combinatorial optimization. RFOX combines an almost constant non-stoquastic $XX$ catalyst with a weak harmonic $ZX$ counter-diabatic term. Using the Floque...
Open-source implementation of the anti-Hermitian contracted Schrödinger equation for electronic ground and excited states
Daniel Gibney, Anthony W Schlimgen, Jan-Niklas Boyn·Apr 2, 2026
Efficient simulation of strongly correlated electrons has become a routine tool in molecular electronic structure theory due to recent advances in approximate configuration interaction (CI) techniques. Nonetheless, the quantitative and predictive des...
Engineering Perfect State Transfer Graphs via Givens Transformations
Pablo Serra, Alejandro Ferrón, Omar Osenda·Apr 2, 2026
Perfect quantum state transfer is achievable in different settings, including linear qubit chains, bi-dimensional arrays, ladders, etc. The most studied case contemplates transferring arbitrary one-qubit pure states in systems with homogeneous intera...
AQ-Stacker: An Adaptive Quantum Matrix Multiplication Algorithm with Scaling via Parallel Hadamard Stacking
Wladimir Silva·Apr 2, 2026
Matrix multiplication (MatMul) is the computational backbone of modern machine learning, yet its classical complexity remains a bottleneck for large-scale data processing. We propose a hybrid quantum-classical algorithm for matrix multiplication base...
Hybrid quantum-classical dynamics with stationary thermal states
Adrián A. Budini·Apr 2, 2026
Quantum and classical systems can consistently be coupled via non-unitary time-irreversible mechanisms. In this paper we characterize which kind of corresponding dynamics converge in the stationary regime to a thermal hybrid state, that is, a density...
Absolute Schmidt number: characterization, detection and resource-theoretic quantification
Bivas Mallick, Saheli Mukherjee, Nirman Ganguly +1 more·Apr 2, 2026
The dimensionality of entanglement, quantified by the Schmidt number, is a valuable resource for a wide range of quantum information processing tasks. In this work, we introduce the notion of the absolute Schmidt number, referring to states whose Sch...
Localized Entanglement Purification
Katerina Stloukalova, Jorge Miguel-Ramiro, Wolfgang Dür +1 more·Apr 2, 2026
Entanglement purification protocols are fundamental primitives in quantum communication, enabling the distillation of high-quality entanglement using only local operations and classical communication. For large multipartite states, however, existing ...
Bounding the entanglement of a state from its spectrum
Jofre Abellanet-Vidal, Guillem Müller-Rigat, Albert Rico +1 more·Apr 2, 2026
Recent efforts have focused on characterizing the set of separable states that cannot be made entangled by any global unitary transformation. Here we characterize the set of states whose entanglement content cannot be increased under any unitary. By ...
Provable quantum thermalization without statistical averages
Amit Vikram·Apr 2, 2026
We develop a rigorous system-agnostic method to predict quantum thermalization in an overwhelming fraction of accessible pure states in a many-body system, entirely in terms of certain out-of-time-ordered correlators of few-body observables. In contr...
Scalable Determination of Penalization Weights for Constrained Optimizations on Approximate Solvers
Edoardo Alessandroni, Sergi Ramos-Calderer, Michel Krispin +5 more·Apr 2, 2026
Quadratic unconstrained binary optimization (QUBO) provides problem formulations for various computational problems that can be solved with dedicated QUBO solvers, which can be based on classical or quantum computation. A common approach to constrain...
Robust Correlation-Induced Localization Under Time-Reversal Symmetry Breaking
Bikram Pain, Sthitadhi Roy, Jens H. Bardarson +1 more·Apr 2, 2026
We study Anderson localization in a one-dimensional disordered system with long-range correlated hopping decaying as $1/r^{a}$ with complex hopping amplitudes that break time-reversal symmetry in a tunable fashion by varying their argument. We find a...
Towards High-Brightness Perfect Photon Blockade
Zhi-Guang Lu, Xin-You Lü·Apr 2, 2026
Single-photon sources with high single-photon purity and high brightness are key elements of many future quantum technologies. While photon blockade (PB) is widely exploited in the development of such sources, achieving the coexistence of high purity...