Category: Paper

Niklas Hörnedal, Oskar A. Prośniak, Adolfo del Campo, and Aurélia Chenu,

Quantum 9, 1729 (2025).

Non-Hermitian dynamics in quantum systems preserves the rank of the state density operator. Using this insight, we develop a geometric framework to describe its time evolution. In particular…

Christopher A. Pattison, Anirudh Krishna, and John Preskill,

Quantum 9, 1728 (2025).

Constant-rate low-density parity-check (LDPC) codes are promising candidates for constructing efficient fault-tolerant quantum memories. However, if physical gates are subject to geometric-l…

Piotr Czarnik, Michael McKerns, Andrew T. Sornborger, and Lukasz Cincio,

Quantum 9, 1727 (2025).

Error mitigation will play an important role in practical applications of near-term noisy quantum computers. Current error mitigation methods typically concentrate on correction quality at t…

Tom O’Leary, Lewis W. Anderson, Dieter Jaksch, and Martin Kiffner,

Quantum 9, 1726 (2025).

We present an iterative generalisation of the quantum subspace expansion algorithm used with a Krylov basis. The iterative construction connects a sequence of subspaces via their lowest ener…

Hongye Yu and Tzu-Chieh Wei,

Quantum 9, 1724 (2025).

Current noisy quantum computers have multiple types of errors, which can occur in the state preparation, measurement/readout, and gate operation, as well as intrinsic decoherence and relaxat…

Ziang Wang, Feng Wu, Hui-Hai Zhao, Xin Wan, and Xiaotong Ni,

Quantum 9, 1722 (2025).

One significant advantage of superconducting processors is their extensive design flexibility, which encompasses various types of qubits and interactions. Given the large number of tunable p…

Vittorio D’Esposito, Giuseppe Fabiano, Domenico Frattulillo, and Flavio Mercati,

Quantum 9, 1721 (2025).

Motivated by the expectation that relativistic symmetries might acquire quantum features in Quantum Gravity, we take the first steps towards a theory of ''Doubly'' Quantum Mechanics, a modif…

Adam Burchardt and Frederik Hahn,

Quantum 9, 1720 (2025).

This paper introduces the foliage partition, an easy-to-compute LC-invariant for graph states, of computational complexity $\mathcal{O}(n^3)$ in the number of qubits. Inspired by the foliage o…

Szilárd Szalay and Géza Tóth,

Quantum 9, 1718 (2025).

We work out the general theory of one-parameter families of partial entanglement properties and the resulting entanglement depth-like quantities. Special cases of these are the depth of part…

Jordi Weggemans,

Quantum 9, 1717 (2025).

In unitary property testing a quantum algorithm, also known as a tester, is given query access to a black-box unitary and has to decide whether it satisfies some property. We propose a new t…

Yaroslav Balytskyi, Yevgen Kotukh, Gennady Khalimov, and Sang-Yoon Chang,

Quantum 9, 1716 (2025).

$\mathcal{PT}$-symmetric systems have garnered significant attention due to their unconventional properties. Despite the growing interest, there remains an ongoing debate about whether these s…

Dominique Spehner,

Quantum 9, 1715 (2025).

We study the geodesics on the manifold of mixed quantum states for the Bures metric. It is shown that these geodesics correspond to physical non-Markovian evolutions of the system coupled to…

Marco Ballarin, Pietro Silvi, Simone Montangero, and Daniel Jaschke,

Quantum 9, 1714 (2025).

We introduce an optimal strategy to sample quantum outcomes of local measurement strings for isometric tensor network states. Our method generates samples based on an exact cumulative boundi…