Quantum

Paper

The cost of solving linear differential equations on a quantum computer: fast-forwarding to explicit resource counts

David Jennings, Matteo Lostaglio, Robert B. Lowrie, Sam Pallister, and Andrew T. Sornborger,

Quantum 8, 1553 (2024).

How well can quantum computers simulate classical dynamical systems? There is increasing effort in developing quantum algorithms to efficiently simulate dynamics beyond Hamiltonian simulatio…

Paper

State preparation by shallow circuits using feed forward

Harry Buhrman, Marten Folkertsma, Bruno Loff, and Niels M. P. Neumann,

Quantum 8, 1552 (2024).

Fault tolerant quantum computers repetitively apply a four-step procedure: First, perform a few one and two-qubit quantum gates. Second, perform a syndrome measurement on a subset of the qub…

Paper

Energy preserving evolutions over Bosonic systems

Paul Gondolf, Tim Möbus, and Cambyse Rouzé,

Quantum 8, 1551 (2024).

The exponential convergence to invariant subspaces of quantum Markov semigroups plays a crucial role in quantum information theory. One such example is in bosonic error correction schemes, w…

Paper

Polytopes of Absolutely Wigner Bounded Spin States

Jérôme Denis, Jack Davis, Robert B. Mann, and John Martin,

Quantum 8, 1550 (2024).

Quasiprobability has become an increasingly popular notion for characterising non-classicality in quantum information, thermodynamics, and metrology. Two important distributions with non-pos…

Paper

Improved simulation of quantum circuits dominated by free fermionic operations

Oliver Reardon-Smith, Michał Oszmaniec, and Kamil Korzekwa,

Quantum 8, 1549 (2024).

We present a classical algorithm for simulating universal quantum circuits composed of "free" nearest-neighbour matchgates or equivalently fermionic-linear-optical (FLO) gates, and "resource…

Paper

Single-qubit gate teleportation provides a quantum advantage

Libor Caha, Xavier Coiteux-Roy, and Robert Koenig,

Quantum 8, 1548 (2024).

Gate-teleportation circuits are arguably among the most basic examples of computations believed to provide a quantum computational advantage: In seminal work [1], Terhal and DiVincenzo have…

Paper

Quantum conformal symmetries for spacetimes in superposition

Viktoria Kabel, Anne-Catherine de la Hamette, Esteban Castro-Ruiz, and Časlav Brukner,

Quantum 8, 1547 (2024).

Without a complete theory of quantum gravity, the question of how quantum fields and quantum particles behave in a superposition of spacetimes seems beyond the reach of theoretical and exper…

Paper

Projective toric designs, quantum state designs, and mutually unbiased bases

Joseph T. Iosue, T. C. Mooney, Adam Ehrenberg, and Alexey V. Gorshkov,

Quantum 8, 1546 (2024).

Toric $t$-designs, or equivalently $t$-designs on the diagonal subgroup of the unitary group, are sets of points on the torus over which sums reproduce integrals of degree $t$ monomials over the f…

Paper

Problem-tailored Simulation of Energy Transport on Noisy Quantum Computers

I-Chi Chen, Klée Pollock, Yong-Xin Yao, Peter P. Orth, and Thomas Iadecola,

Quantum 8, 1545 (2024).

The transport of conserved quantities like spin and charge is fundamental to characterizing the behavior of quantum many-body systems. Numerically simulating such dynamics is generically cha…

Paper

Efficient MPS representations and quantum circuits from the Fourier modes of classical image data

Bernhard Jobst, Kevin Shen, Carlos A. Riofrío, Elvira Shishenina, and Frank Pollmann,

Quantum 8, 1544 (2024).

Machine learning tasks are an exciting application for quantum computers, as it has been proven that they can learn certain problems more efficiently than classical ones. Applying quantum ma…

Paper

Possibilistic and maximal indefinite causal order in the quantum switch

Tein van der Lugt and Nick Ormrod,

Quantum 8, 1543 (2024).

It was recently found that the indefinite causal order in the quantum switch can be certified device-independently when assuming the impossibility of superluminal influences. Here we strengt…

Paper

Learning to rank quantum circuits for hardware-optimized performance enhancement

Gavin S. Hartnett, Aaron Barbosa, Pranav S. Mundada, Michael Hush, Michael J. Biercuk, and Yuval Baum,

Quantum 8, 1542 (2024).

We introduce and experimentally test a machine-learning-based method for ranking logically equivalent quantum circuits based on expected performance estimates derived from a training procedu…

Paper

Constructing quantum codes from any classical code and their embedding in ground space of local Hamiltonians

Ramis Movassagh and Yingkai Ouyang,

Quantum 8, 1541 (2024).

Implementing robust quantum error correction (QEC) is imperative for harnessing the promise of quantum technologies. We introduce a framework that takes $any$ classical code and explicitly con…

Paper

Tight concentration inequalities for quantum adversarial setups exploiting permutation symmetry

Takaya Matsuura, Shinichiro Yamano, Yui Kuramochi, Toshihiko Sasaki, and Masato Koashi,

Quantum 8, 1540 (2024).

We developed new concentration inequalities for a quantum state on an $N$-qudit system or measurement outcomes on it that apply to an adversarial setup, where an adversary prepares the quantum…

Paper

Bosonic Pauli+: Efficient Simulation of Concatenated Gottesman-Kitaev-Preskill Codes

Florian Hopfmueller, Maxime Tremblay, Philippe St-Jean, Baptiste Royer, and Marc-Antoine Lemonde,

Quantum 8, 1539 (2024).

A promising route towards fault-tolerant quantum error correction is the concatenation of a Gottesman-Kitaev-Preskill (GKP) code with a qubit code. Development of such concatenated codes req…

Paper

Beyond MP2 initialization for unitary coupled cluster quantum circuits

Mark R. Hirsbrunner, Diana Chamaki, J. Wayne Mullinax, and Norm M. Tubman,

Quantum 8, 1538 (2024).

The unitary coupled cluster (UCC) ansatz is a promising tool for achieving high-precision results using the variational quantum eigensolver (VQE) algorithm in the NISQ era. However, results…

Category: Paper