Quantum

Paper

Bounds in Sequential Unambiguous Discrimination of Multiple Pure Quantum States

Jordi Pérez-Guijarro, Alba Pagès-Zamora, and Javier R. Fonollosa,

Quantum 9, 1919 (2025).

Sequential methods for quantum hypothesis testing offer significant advantages over fixed-length approaches, which rely on a predefined number of state copies. Despite their potential, these…

Paper

Refuting spectral compatibility of quantum marginals

Felix Huber and Nikolai Wyderka,

Quantum 9, 1918 (2025).

The spectral variant of the quantum marginal problem asks: Given prescribed spectra for a set of overlapping quantum marginals, does there exist a compatible joint state? The main idea of th…

Paper

A Randomized Method for Simulating Lindblad Equations and Thermal State Preparation

Hongrui Chen, Bowen Li, Jianfeng Lu, and Lexing Ying,

Quantum 9, 1917 (2025).

We study a qDRIFT-type randomized method to simulate Lindblad dynamics by decomposing its generator into an ensemble of Lindbladians, $\mathcal{L} = \sum_{a \in \mathcal{A}} \mathcal{L}_a$, wh…

Paper

Topologically driven no-superposing theorem with a tight error bound

Zuzana Gavorová,

Quantum 9, 1916 (2025).

To better understand quantum computation we can search for its limits or no-gos, especially if analogous limits do not appear in classical computation. Classical computation easily implement…

Paper

Boundaries for quantum advantage with single photons and loop-based time-bin interferometers

Samo Novák, David D. Roberts, Alexander Makarovskiy, Raúl García-Patrón, and William R. Clements,

Quantum 9, 1915 (2025).

Loop-based boson samplers interfere photons in the time degree of freedom using a sequence of delay lines. Since they require few hardware components while also allowing for long-range entan…

Paper

Optimal Fermionic Joint Measurements for Estimating Non-Commuting Majorana Observables

Daniel McNulty, Susane Calegari, and Michał Oszmaniec,

Quantum 9, 1914 (2025).

An important class of fermionic observables, relevant in tasks such as fermionic partial tomography and estimating energy levels of chemical Hamiltonians, are the binary measurements obtaine…

Paper

A Graphical Calculus for Quantum Computing with Multiple Qudits using Generalized Clifford Algebras

Robert Lin,

Quantum 9, 1913 (2025).

In this work, we develop a graphical calculus for multi-qudit computations with generalized Clifford algebras, building off the algebraic framework developed in our prior work. We build our…

Paper

Instability of steady-state mixed-state symmetry-protected topological order to strong-to-weak spontaneous symmetry breaking

Jeet Shah, Christopher Fechisin, Yu-Xin Wang, Joseph T. Iosue, James D. Watson, Yan-Qi Wang, Brayden Ware, Alexey V. Gorshkov, and Cheng-Ju Lin,

Quantum 9, 1912 (2025).

Recent experimental progress in controlling open quantum systems enables the pursuit of mixed-state nonequilibrium quantum phases. We investigate whether open quantum systems hosting mixed-s…

Paper

Multipartite Entanglement Distribution in Quantum Networks using Subgraph Complementations

Aniruddha Sen, Kenneth Goodenough, and Don Towsley,

Quantum 9, 1911 (2025).

Quantum networks are important for quantum communication, enabling tasks such as quantum teleportation, quantum key distribution, quantum sensing, and quantum error correction, often utilizi…

Paper

Zero-error communication under discrete-time Markovian dynamics

Satvik Singh, Mizanur Rahaman, and Nilanjana Datta,

Quantum 9, 1910 (2025).

Consider an open quantum system with (discrete-time) Markovian dynamics. Our task is to store information in the system in such a way that it can be retrieved perfectly, even after the syste…

Paper

Direct Analysis of Zero-Noise Extrapolation: Polynomial Methods, Error Bounds, and Simultaneous Physical-Algorithmic Error Mitigation

Pegah Mohammadipour and Xiantao Li,

Quantum 9, 1909 (2025).

Zero-noise extrapolation (ZNE) is a widely used quantum error mitigation technique that artificially amplifies circuit noise and then extrapolates the results to the noise-free circuit. A co…

Paper

Dicke subsystems are entangled

Szilárd Szalay and Péter Nyári,

Quantum 9, 1908 (2025).

We show that all reduced states of nonproduct symmetric Dicke states of arbitrary number of qudits are genuinely multipartite entangled, and of nonpositive partial transpose with respect to…

Paper

Efficient Learning of Quantum States Prepared With Few Non-Clifford Gates

Sabee Grewal, Vishnu Iyer, William Kretschmer, and Daniel Liang,

Quantum 9, 1907 (2025).

We give a pair of algorithms that efficiently learn a quantum state prepared by Clifford gates and $O(\log n)$ non-Clifford gates. Specifically, for an $n$-qubit state $|\psi\rangle$ prepared with…

Paper

Improving Quantum Approximate Optimization by Noise-Directed Adaptive Remapping

Filip B. Maciejewski, Jacob Biamonte, Stuart Hadfield, and Davide Venturelli,

Quantum 9, 1906 (2025).

We present Noise-Directed Adaptive Remapping (NDAR), a heuristic algorithm for approximately solving binary optimization problems by leveraging certain types of noise. We consider access to…

Paper

Designing fault-tolerant circuits using detector error models

Peter-Jan H.S. Derks, Alex Townsend-Teague, Ansgar G. Burchards, and Jens Eisert,

Quantum 9, 1905 (2025).

Quantum error-correcting codes, such as subspace, subsystem, and Floquet codes, are typically constructed within the stabilizer formalism, which does not fully capture the idea of fault tole…

Paper

Non-Heisenbergian quantum mechanics

MohammadJavad Kazemi and Ghadir Jafari,

Quantum 9, 1904 (2025).

Relaxing the postulates of an axiomatic theory is a natural way to find more general theories, and historically, the discovery of non-Euclidean geometry is a famous example of this procedure…

Category: Paper