Papers
Live trends in quantum computing research, updated daily from arXiv.
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Operational modes of a Raman-coupled two-qubit quantum thermal machine
Alonso Alcalá, Charlie Oncebay, Onofre Rojas +1 more·Jan 6, 2026
We investigate a quantum thermal machine composed of two qubits coupled through a Raman-induced exchange interaction and driven by inhomogeneous transition frequencies. The system is analyzed within Carnot, Otto, and Stirling thermodynamic cycles, in...
Gradient descent reliably finds depth- and gate-optimal circuits for generic unitaries
Janani Gomathi, Alex Meiburg·Jan 6, 2026
When the gate set has continuous parameters, synthesizing a unitary operator as a quantum circuit is always possible using exact methods, but finding minimal circuits efficiently remains a challenging problem. The landscape is very different for comp...
Collective dynamics versus entanglement in quantum battery performance
Rohit Kumar Shukla, Sunil K. Mishra, Ujjwal Sen·Jan 6, 2026
Identifying the origin of enhanced charging performance in many-body quantum batteries remains a central challenge in quantum thermodynamics. It is unclear whether improvements in stored energy and instantaneous charging power stem from genuinely qua...
Multipartite Non-local Magic and SYK Model
Vinay Malvimat, Matthieu Sarkis, Yena Suk +1 more·Jan 6, 2026
We investigate the structure of quantum magic in interacting disordered fermionic systems, quantifying non-stabilizerness via the fermionic stabilizer Rényi entropy (SRE). To resolve the distribution of magic across different scales, we introduce a m...
Egorov-Type Semiclassical Limits for Open Quantum Systems with a Bi-Lindblad Structure
Leonardo Colombo, Asier López-Gordón·Jan 6, 2026
This paper develops a bridge between bi-Hamiltonian structures of Poisson-Lie type, contact Hamiltonian dynamics, and the Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) formalism for quantum open systems. On the classical side, we consider bi-Hamiltoni...
Who can compete with quantum computers? Lecture notes on quantum inspired tensor networks computational techniques
Xavier Waintal, Chen-How Huang, Christoph W. Groth·Jan 6, 2026
This is a set of lectures on tensor networks with a strong emphasis on the core algorithms involving Matrix Product States (MPS) and Matrix Product Operators (MPO). Compared to other presentations, particular care has been given to disentangle aspect...
Entanglement signatures of quantum criticality in Floquet non-Hermitian topological systems
Siyuan Cheng, Rui Xie, Xiaosen Yang +2 more·Jan 6, 2026
The entanglement entropy can be an effective diagnostic tool for probing topological phase transitions. In one-dimensional single particle systems, the periodic driving generates a variety of topological phases and edge modes. In this work, we invest...
Nonseparability as Time-Averaged Dynamic States
Mathieu Padlewski, Tim Tuuva, Benjamin Apffel +2 more·Jan 6, 2026
Nonseparability - multipartite states that cannot be factorized - is one of the most striking features of quantum mechanics, as it gives rise to entanglement and non-causal correlations. In quantum computing, it also contributes directly to the compu...
Does relativistic motion really freeze initially maximal entanglement?
Si-Han Li, Hui-Chen Yang, Rui-Yang Xu +1 more·Jan 6, 2026
We investigate the relativistic dynamics of quantum entanglement in a four-qubit cluster ($CL_4$) state using a fully operational Unruh-DeWitt detector framework. Contrary to the widely held expectation that the Unruh effect inevitably degrades initi...
Violation of Bell Monogamy Relations
Abhisek Panda, Chandan Datta, Pankaj Agrawal·Jan 6, 2026
The entangled multipartite systems, specially in pure states, exhibit the phenomenon entanglement monogamy. Such systems also display the phenomenon of Bell nonlocality. Like entanglement monogamy relations, there are Bell monogamy relations. These r...
Duality and measurement: the Copenhagen reconciliation
Vincenzo Chilla·Jan 6, 2026
Duality, not monism, constitutes the hermeneutic lens that characterizes the original Copenhagen interpretation of Quantum Mechanics. Therefore, evoking the principles of correspondence and complementarity, in this work we re-assert a dual-aspect rea...
Trading symmetry for Hilbert-space dimension in Bell-inequality violation
Hsin-Yu Hsu, Gelo Noel M. Tabia, Kai-Siang Chen +4 more·Jan 6, 2026
In quantum information, asymmetry, i.e., the lack of symmetry, is a resource allowing one to accomplish certain tasks that are otherwise impossible. Similarly, in a Bell test using any given Bell inequality, the maximum violation achievable using qua...
Entanglement Entropy for Screened Interactions via Dimensional Mapping to Harmonic Oscillators
Akshay Kulkarni, Rahul Nigam·Jan 6, 2026
We investigate interaction-induced corrections to entanglement entropy by mapping a screened Yukawa-type interaction to an effective harmonic oscillator system with controlled anharmonic perturbations. Starting from a one-dimensional interaction $V(x...
Quantum-Enhanced Neural Contextual Bandit Algorithms
Yuqi Huang, Vincent Y. F Tan, Sharu Theresa Jose·Jan 6, 2026
Stochastic contextual bandits are fundamental for sequential decision-making but pose significant challenges for existing neural network-based algorithms, particularly when scaling to quantum neural networks (QNNs) due to issues such as massive over-...
Quantum key distribution without authentication and information leakage
Zixuan Hu, Zhenyu Li·Jan 6, 2026
Quantum key distribution (QKD) is the most widely studied quantum cryptographic model that exploits quantum effects to achieve information-theoretically secure key establishment. Conventional QKD contains public classical post-processing steps that r...
Quantum-enhanced long short-term memory with attention for spatial permeability prediction in oilfield reservoirs
Muzhen Zhang, Yujie Cheng, Zhanxiang Lei·Jan 6, 2026
Spatial prediction of reservoir parameters, especially permeability, is crucial for oil and gas exploration and development. However, the wide range and high variability of permeability prevent existing methods from providing reliable predictions. Fo...
Q-based, objective-field model for wave-function collapse: Analyzing measurement on a macroscopic superposition state
Channa Hatharasinghe, Ashleigh Willis, Run Yan Teh +2 more·Jan 6, 2026
The measurement problem remains unaddressed in modern physics, with an array of proposed solutions but as of yet no agreed resolution. In this paper, we examine measurement using the Q-based, objective-field model for quantum mechanics. Schrodinger c...
Multiparameter quantum estimation with a uniformly accelerated Unruh-DeWitt detector
Shoukang Chang, Yashu Yang, Wei Ye +6 more·Jan 6, 2026
The uniformly accelerated Unruh-DeWitt detector serves as a fundamental model in relativistic quantum metrology. While previous studies have mainly concentrated on single-parameter estimation via quantum Cramér-Rao bound, the multi-parameter case rem...
Stable boundary modes for fragile topology from spontaneous PT-symmetry breaking
Kang Yang, Fei Song, Piet W. Brouwer·Jan 6, 2026
Two-dimensional topological insulators protected by nonlocal symmetries or with fragile topology usually do not admit robust in-gap edge modes due to the incompatibility between the symmetry and the boundary. Here, we show that in a parity-time (PT) ...
Localization of joint quantum measurements on $\mathbb{C}^d \otimes \mathbb{C}^d$ by entangled resources with Schmidt number at most $d$
Seiseki Akibue, Jisho Miyazaki·Jan 6, 2026
Localizable measurements are joint quantum measurements that can be implemented using only non-adaptive local operations and shared entanglement. We provide a protocol-independent characterization of localizable projection-valued measures (PVMs) by e...