Papers
Live trends in quantum computing research, updated daily from arXiv.
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Variational formulae for entropy-like functionals for states in von Neumann algebras
Andrzej Łuczak, Hanna Podsędkowska, Rafał Wieczorek·Oct 8, 2025
The paper presents variational formulae for entropy-like functionals, including Segal and Rényi entropies, for normal states on semifinite von Neumann algebras. The considered functionals are of the form $τ(f(h))$ where $τ$ is a normal faithful semif...
Noisy-Syndrome Decoding of Hypergraph Product Codes
Venkata Gandikota, Elena Grigorescu, Vatsal Jha +1 more·Oct 8, 2025
Hypergraph product codes are a prototypical family of quantum codes with state-of-the-art decodability properties. Recently, Golowich and Guruswami (FOCS 2024) showed a reduction from quantum decoding to syndrome decoding for a general class of codes...
Beyond Hoeffding and Chernoff: Trading conclusiveness for advantages in quantum hypothesis testing
Kaiyuan Ji, Bartosz Regula·Oct 8, 2025
The ultimate limits of quantum state discrimination are often thought to be captured by asymptotic bounds that restrict the achievable error probabilities, notably the quantum Chernoff and Hoeffding bounds. Here we study hypothesis testing protocols ...
Nonlinear Coupling between Motional Modes in Trapped Ion Quantum Processors
Wes Johnson, Brandon Ruzic·Oct 8, 2025
Trapped-ion crystals are a leading platform for quantum information science, but achieving the high-fidelity entangling gates required for fault-tolerant quantum computing becomes harder as system size increases. As systems scale, spectral crowding m...
Mass-to-Horizon Relation and Entropy Beyond the Bekenstein-Hawking Limit
Hussain Gohar·Oct 8, 2025
We introduce a generalized mass-horizon relation applicable to cosmological horizons. This formulation provides a unified framework for deriving a broad class of Bekenstein entropy extensions motivated by statistical mechanics, quantum gravity, and p...
Entanglement in von Neumann Algebraic Quantum Information Theory
Lauritz van Luijk·Oct 8, 2025
In quantum systems with infinitely many degrees of freedom, states can be infinitely entangled across a pair of subsystems, but are there different forms of infinite entanglement? To understand entanglement in such systems, we use a framework in whic...
Correlation Lengths for Stochastic Matrix Product States
Lubashan Pathirana, Albert H. Werner·Oct 8, 2025
We introduce a general model of stochastically generated matrix product states (MPS) in which the local tensors share a common distribution and form a strictly stationary sequence, without requiring spatial independence. Under natural conditions on t...
Constructive counterexamples to the additivity of minimum output Rényi entropy of quantum channels for all $p>1$
Harm Derksen, Benjamin Lovitz·Oct 8, 2025
We present explicit quantum channels with strictly sub-additive minimum output Rényi entropy for all $p>1$, improving upon prior constructions which handled $p>2$. Our example is provided by explicit constructions of linear subspaces with high geomet...
Polyhedral Classical Simulators for Quantum Computation
Cihan Okay·Oct 8, 2025
Quantum advantage in computation refers to the existence of computational tasks that can be performed efficiently on a quantum computer but cannot be efficiently simulated on any classical computer. Identifying the precise boundary of efficient class...
On Quantum Computation Using Bias-Preserving Gates
Debadrito Roy, Aryaman Manish Kolhe, V. Lalitha +1 more·Oct 8, 2025
Certain types of quantum computing platforms, such as those realized using Rydberg atoms or Kerr-cat qubits, are natively more susceptible to Pauli-Z noise than Pauli-X noise, or vice versa. On such hardware, it is useful to ensure that computations ...
No exponential quantum speedup for $\mathrm{SIS}^\infty$ anymore
Robin Kothari, Ryan O'Donnell, Kewen Wu·Oct 8, 2025
In 2021, Chen, Liu, and Zhandry presented an efficient quantum algorithm for the average-case $\ell_\infty$-Short Integer Solution ($\mathrm{SIS}^\infty$) problem, in a parameter range outside the normal range of cryptographic interest, but still wit...
Error correction phase transition in noisy random quantum circuits
Jon Nelson, Joel Rajakumar, Michael J. Gullans·Oct 8, 2025
In this work, we study the task of encoding logical information via a noisy quantum circuit. It is known that at superlogarithmic depth, the output of any noisy circuit without reset gates or intermediate measurements becomes indistinguishable from t...
Efficient Radiofrequency Sensing with Fluorescence Encoding
Nicole Voce, Paul Stevenson·Oct 8, 2025
Optically-active spin qubits have emerged as powerful quantum sensors capable of nanoscale magnetometry, yet conventional coherent sensing approaches are ultimately limited by the coherence time of the sensor, typically precluding detection in the su...
The tensor product of p-adic Hilbert spaces
Paolo Aniello, Lorenzo Guglielmi, Stefano Mancini +1 more·Oct 8, 2025
In the framework of quantum mechanics over a quadratic extension of the ultrametric field of p-adic numbers, we introduce a notion of tensor product of p-adic Hilbert spaces. To this end, following a standard approach, we first consider the algebraic...
Dissipative Generation of Currents by Nonreciprocal Local and Global Environments
Catalin-Mihai Halati·Oct 8, 2025
We investigate the mechanisms necessary for the stabilization of complex quantum correlations by exploring dissipative couplings to nonreciprocal reservoirs. We analyze the role of locality in the coupling between the environment and the quantum syst...
3-Local Hamiltonian Problem and Constant Relative Error Quantum Partition Function Approximation: $O(2^{\frac{n}{2}})$ Algorithm Is Nearly Optimal under QSETH
Nai-Hui Chia, Yu-Ching Shen·Oct 8, 2025
We investigate the computational complexity of the Local Hamiltonian (LH) problem and the approximation of the Quantum Partition Function (QPF), two central problems in quantum many-body physics and quantum complexity theory. Both problems are known ...
A quantum state transfer protocol with Ising Hamiltonians
Oscar Michel, Matthias Werner, Arnau Riera·Oct 8, 2025
Quantum state transfer is a fundamental requirement for scalable quantum computation, where fast and reliable communication between distant subsystems is essential. In this work, we present a protocol for quantum state transfer in linear Ising chains...
Simulation of Quantum Repeater Networks under Decoherence and Purification Constraints
Wenhan Li, Shiyu Zhang·Oct 8, 2025
Long-distance quantum communication requires reliable entanglement distribution, but direct generation with protocols such as Barrett--Kok suffers from exponentially decreasing success probability with distance, making it impractical over hundreds of...
Quantum Filtering of Hydrogen Isotopes through Graphene
Joshua Hale, Theja N. De Silva·Oct 8, 2025
Driven by the growing demand in the energy, medical, and industrial sectors, we investigate a hydrogen isotope separation technique that offers both a high separation factor and economic feasibility. Our findings reveal that filtering isotopes throug...
Angular Geometry of Atomic Multipole Transitions
Wesley C. Campbell·Oct 8, 2025
A simple way to calculate Rabi frequencies is outlined for interactions of atomic or nuclear multipole moments with laser fields that focuses on their relative geometry. The resulting expression takes the form of a dot product between the laser polar...