Category: Paper

Yanic Cardin and Nicolás Quesada,

Quantum 8, 1521 (2024).

We develop closed-form expressions for the moments and cumulants of Gaussian states when measured in the photon-number basis. We express the photon-number moments of a Gaussian state in term…

Zohreh Davoudi, Chung-Chun Hsieh, and Saurabh V. Kadam,

Quantum 8, 1520 (2024).

Quantum simulation holds promise of enabling a complete description of high-energy scattering processes rooted in gauge theories of the Standard Model. A first step in such simulations is pr…

Ulysse Chabaud, Roohollah Ghobadi, Salman Beigi, and Saleh Rahimi-Keshari,

Quantum 8, 1519 (2024).

Quantum kernel methods are a proposal for achieving quantum computational advantage in machine learning. They are based on a hybrid classical-quantum computation where a function called the…

Johannes Fankhauser,

Quantum 8, 1518 (2024).

One of quantum theory's salient features is its apparent indeterminism, i.e. measurement outcomes are typically probabilistic. We formally define and address whether this uncertainty is unav…

Masahito Hayashi,

Quantum 8, 1517 (2024).

A Dicke state and its decohered state are invariant for permutation. However, when another qubits state to each of them is attached, the whole state is not invariant for permutation, and has…

Jwo-Sy Chen, Erik Nielsen, Matthew Ebert, Volkan Inlek, Kenneth Wright, Vandiver Chaplin, Andrii Maksymov, Eduardo Páez, Amrit Poudel, Peter Maunz, and John Gamble,

Quantum 8, 1516 (2024).

Quantum computers are rapidly becoming more capable, with dramatic increases in both qubit count [1] and quality [2]. Among different hardware approaches, trapped-ion quantum processors are…

Teiko Heinosaari and Oskari Kerppo,

Quantum 8, 1515 (2024).

A prepare-and-measure scenario is naturally described by a communication matrix that collects all conditional outcome probabilities of the scenario into a row-stochastic matrix. The set of a…

Hippolyte Dourdent, Alastair A. Abbott, Ivan Šupić, and Cyril Branciard,

Quantum 8, 1514 (2024).

Causal nonseparability is the property underlying quantum processes incompatible with a definite causal order. So far it has remained a central open question as to whether any process with a…

Matteo Votto, Johannes Zeiher, and Benoît Vermersch,

Quantum 8, 1513 (2024).

We propose a protocol to realize quantum simulation and computation in spin systems with long-range interactions. Our approach relies on the local addressing of single spins with external fi…

Alex Fischer and Akimasa Miyake,

Quantum 8, 1511 (2024).

Real quantum computers will be subject to complicated, qubit-dependent noise, instead of simple noise such as depolarizing noise with the same strength for all qubits. We can do quantum erro…

David Raveh and Rafael I. Nepomechie,

Quantum 8, 1510 (2024).

We present an explicit quantum circuit that prepares an arbitrary $U(1)$-eigenstate on a quantum computer, including the exact eigenstates of the spin-$1/2 XXZ$ quantum spin chain with either op…

Dylan Lewis, Stephan Eidenbenz, Balasubramanya Nadiga, and Yiğit Subaşı,

Quantum 8, 1509 (2024).

We investigate the limitations of quantum computers for solving nonlinear dynamical systems. In particular, we tighten the worst-case bounds of the quantum Carleman linearisation (QCL) algor…

Pablo Arrighi, Amélia Durbec, and Matt Wilson,

Quantum 8, 1508 (2024).

The formalism of quantum theory over discrete systems is extended in two significant ways. First, quantum evolutions are generalized to act over entire network configurations, so that nodes…

Lucas Berent, Lukas Burgholzer, Peter-Jan H.S. Derks, Jens Eisert, and Robert Wille,

Quantum 8, 1506 (2024).

In classical computing, error-correcting codes are well established and are ubiquitous both in theory and practical applications. For quantum computing, error-correction is essential as well…