Quantum

Paper

Variational Perturbation Theory in Open Quantum Systems for Efficient Steady State Computation

André Melo, Gaspard Beugnot, and Fabrizio Minganti,

Quantum 10, 2246 (2026).

Determining the steady state of an open quantum system is crucial for characterizing quantum devices and studying various physical phenomena. Often, computing a single steady state is insuff…

Paper

A Symmetry-Enabled Direct Quantum Protocol for Many-Body Green’s Functions

Changhao Yi and Cunlu Zhou,

Quantum 10, 2245 (2026).

We present a symmetry-enabled direct quantum protocol for computing many-body Green's functions, a central tool for studying strongly correlated quantum systems. Our protocol relies only on…

Paper

Failure of the mean-field Hartree approximation for a bosonic many-body system with non-Hermitian Hamiltonian

Matias Ginzburg, Simone Rademacher, and Giacomo De Palma,

Quantum 10, 2244 (2026).

Mean-field Hartree theory is a central tool for reducing many-body dynamics to an effective one-particle evolution. This approximation has been employed when the Hamiltonian governing the ma…

Paper

Symmetry defects and gauging for quantum states with matrix product unitary symmetries

Adrián Franco-Rubio, Arkadiusz Bochniak, and J. Ignacio Cirac,

Quantum 10, 2243 (2026).

In this work, we examine the consequences of the existence of a finite group of matrix product unitary (MPU) symmetries for matrix product states (MPS). We generalize the well-understood pic…

Paper

The three kinds of three-qubit entanglement

Szilárd Szalay,

Quantum 10, 2242 (2026).

We construct an important missing piece in the entanglement theory of pure three-qubit states, which is a polynomial measure of W-entanglement. This works in parallel to the three-tangle, wh…

Paper

Work statistics of sudden quantum quenches: A random matrix theory perspective on Gaussianity and its deviations

Miguel Tierz,

Quantum 10, 2241 (2026).

We show that, for sudden quenches, the work distribution reduces to the statistics of the traces of powers of Haar unitaries, which are random unitary matrices drawn uniformly from the unita…

Paper

Asymptotically good bosonic Fock state codes

Dor Elimelech, Arda Aydin, and Alexander Barg,

Quantum 10, 2240 (2026).

We study the error-correction properties of multi-mode Fock-state codes under amplitude-damping (AD) noise, focusing on the asymptotic regime in which the total excitation of the code states…

Paper

Interactive proofs for verifying (quantum) learning and testing

Matthias C. Caro, Jens Eisert, Marcel Hinsche, Marios Ioannou, Alexander Nietner, and Ryan Sweke,

Quantum 10, 2239 (2026).

We consider the problem of testing and learning from data in the presence of resource constraints, such as limited memory or weak data access, which place limitations on the efficiency and f…

Paper

Reliable Entropy Estimation from Observed Statistics for Device-Independent Quantum Cryptography

Gereon Koßmann and René Schwonnek,

Quantum 10, 2238 (2026).

We introduce a numerical framework for reliably estimating conditional von Neumann entropies, a central quantity in device-independent quantum cryptography and randomness generation. Our met…

Paper

Rare Event Simulation of Quantum Error-Correcting Circuits

Carolyn Mayer, Anand Ganti, Uzoma Onunkwo, Tzvetan Metodi, Benjamin Anker, and Jacek Skryzalin,

Quantum 10, 2237 (2026).

We describe a practical approach for accessing the logical failure rates of quantum error-correcting (QEC) circuits under low physical (component) failure rate regimes. Standard Monte Carlo…

Paper

Approach to optimal quantum transport via states over time

Matt Hoogsteder-Riera, John Calsamiglia, and Andreas Winter,

Quantum 10, 2236 (2026).

We approach the problem of constructing a quantum analogue of the immensely fruitful classical transport cost theory of Monge from a new angle. Going back to the original motivations, by whi…

Paper

Quantum Walks on Arbitrary Spatial Networks with Rydberg Atoms

Gabriel Almeida, Raul Santos, Lara Janiurek, and Yasser Omar,

Quantum 10, 2235 (2026).

Rydberg atoms provide a highly promising platform for quantum computation, leveraging their strong tunable interactions to encode and manipulate information in the electronic states of indiv…

Paper

Sampled-Based Guided Quantum Walk: Non-variational quantum algorithm for combinatorial optimization

Ugo Nzongani, Dylan Laplace Mermoud, Giuseppe Di Molfetta, and Andrea Simonetto,

Quantum 10, 2234 (2026).

We introduce SamBa-GQW, a novel quantum algorithm for solving binary combinatorial optimization problems of arbitrary degree with no use of any classical optimizer. The algorithm is based on…

Paper

Quantum algorithms for general nonlinear dynamics based on the Carleman embedding

David Jennings, Kamil Korzekwa, Matteo Lostaglio, Andrew T Sornborger, Yigit Subasi, and Guoming Wang,

Quantum 10, 2233 (2026).

Important nonlinear dynamics, such as those found in plasma and fluid systems, are typically hard to simulate on classical computers. Thus, if fault-tolerant quantum computers could efficien…

Paper

Towards local and compositional measurements in quantum field theory

Robert Oeckl and Adamantia Zampeli,

Quantum 10, 2232 (2026).

A universal framework for the joint measurement of multiple localized observables in quantum field theory satisfying spacetime locality and compositionality is still lacking. We present an a…

Paper

Strict hierarchy between $n$-wise measurement simulability, compatibility structures, and multi-copy compatibility

Lucas Tendick, Costantino Budroni, and Marco Túlio Quintino,

Quantum 10, 2231 (2026).

The incompatibility of quantum measurements, i.e. the fact that certain observable quantities cannot be measured jointly is widely regarded as a distinctive quantum feature with important im…

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