Quantum

Paper

Operational Quantum Average-Case Distances

Filip B. Maciejewski, Zbigniew Puchała, and Michał Oszmaniec,

Quantum 7, 1106 (2023).

We introduce distance measures between quantum states, measurements, and channels based on their statistical distinguishability in generic experiments. Specifically, we analyze the average T…

Paper

Testing identity of collections of quantum states: sample complexity analysis

Marco Fanizza, Raffaele Salvia, and Vittorio Giovannetti,

Quantum 7, 1105 (2023).

We study the problem of testing identity of a collection of unknown quantum states given sample access to this collection, each state appearing with some known probability. We show that for…

Paper

The Round Complexity of Local Operations and Classical Communication (LOCC) in Random-Party Entanglement Distillation

Guangkuo Liu, Ian George, and Eric Chitambar,

Quantum 7, 1104 (2023).

A powerful operational paradigm for distributed quantum information processing involves manipulating pre-shared entanglement by local operations and classical communication (LOCC). The LOCC…

Paper

On a gap in the proof of the generalised quantum Stein’s lemma and its consequences for the reversibility of quantum resources

Mario Berta, Fernando G. S. L. Brandão, Gilad Gour, Ludovico Lami, Martin B. Plenio, Bartosz Regula, and Marco Tomamichel,

Quantum 7, 1103 (2023).

We show that the proof of the generalised quantum Stein's lemma [Brandão & Plenio, Commun. Math. Phys. 295, 791 (2010)] is not correct due to a gap in the argument leading to Lemma III.9. He…

Paper

Integral formula for quantum relative entropy implies data processing inequality

Péter E. Frenkel,

Quantum 7, 1102 (2023).

Integral representations of quantum relative entropy, and of the directional second and higher order derivatives of von Neumann entropy, are established, and used to give simple proofs of fu…

Paper

Bounds on the smallest sets of quantum states with special quantum nonlocality

Mao-Sheng Li and Yan-Ling Wang,

Quantum 7, 1101 (2023).

An orthogonal set of states in multipartite systems is called to be strong quantum nonlocality if it is locally irreducible under every bipartition of the subsystems [46]. In this work, we s…

Paper

A Multi-Qubit Quantum Gate Using the Zeno Effect

Philippe Lewalle, Leigh S. Martin, Emmanuel Flurin, Song Zhang, Eliya Blumenthal, Shay Hacohen-Gourgy, Daniel Burgarth, and K. Birgitta Whaley,

Quantum 7, 1100 (2023).

The Zeno effect, in which repeated observation freezes the dynamics of a quantum system, stands as an iconic oddity of quantum mechanics. When a measurement is unable to distinguish between…

Paper

Energy-efficient quantum non-demolition measurement with a spin-photon interface

Maria Maffei, Bruno O. Goes, Stephen C. Wein, Andrew N. Jordan, Loïc Lanco, and Alexia Auffèves,

Quantum 7, 1099 (2023).

Spin-photon interfaces (SPIs) are key devices of quantum technologies, aimed at coherently transferring quantum information between spin qubits and propagating pulses of polarized light. We…

Paper

Quantum reference frames: derivation of perspective-dependent descriptions via a perspective-neutral structure

Viktor Zelezny,

Quantum 7, 1098 (2023).

In standard quantum mechanics, reference frames are treated as abstract entities. We can think of them as idealized, infinite-mass subsystems which decouple from the rest of the system. In n…

Paper

A Quadratic Speedup in the Optimization of Noisy Quantum Optical Circuits

Robbe De Prins, Yuan Yao, Anuj Apte, and Filippo M. Miatto,

Quantum 7, 1097 (2023).

Linear optical quantum circuits with photon number resolving (PNR) detectors are used for both Gaussian Boson Sampling (GBS) and for the preparation of non-Gaussian states such as Gottesman-…

Paper

Learning ground states of gapped quantum Hamiltonians with Kernel Methods

Clemens Giuliani, Filippo Vicentini, Riccardo Rossi, and Giuseppe Carleo,

Quantum 7, 1096 (2023).

Neural network approaches to approximate the ground state of quantum hamiltonians require the numerical solution of a highly nonlinear optimization problem. We introduce a statistical learni…

Paper

Refined finite-size analysis of binary-modulation continuous-variable quantum key distribution

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

Quantum 7, 1095 (2023).

Recent studies showed the finite-size security of binary-modulation CV-QKD protocols against general attacks. However, they gave poor key-rate scaling against transmission distance. Here, we…

Paper

Tight Cramér-Rao type bounds for multiparameter quantum metrology through conic programming

Masahito Hayashi and Yingkai Ouyang,

Quantum 7, 1094 (2023).

In the quest to unlock the maximum potential of quantum sensors, it is of paramount importance to have practical measurement strategies that can estimate incompatible parameters with best pr…

Paper

Local Probabilistic Decoding of a Quantum Code

T. R. Scruby and K. Nemoto,

Quantum 7, 1093 (2023).

$\tt{flip}$ is an extremely simple and maximally local classical decoder which has been used to great effect in certain classes of classical codes. When applied to quantum codes there exist co…

Paper

Stabilizer entropies and nonstabilizerness monotones

Tobias Haug and Lorenzo Piroli,

Quantum 7, 1092 (2023).

We study different aspects of the stabilizer entropies (SEs) and compare them against known nonstabilizerness monotones such as the min-relative entropy and the robustness of magic. First, b…

Paper

Modified dipole-dipole interactions in the presence of a nanophotonic waveguide

Mathias B. M. Svendsen and Beatriz Olmos,

Quantum 7, 1091 (2023).

When an emitter ensemble interacts with the electromagnetic field, dipole-dipole interactions are induced between the emitters. The magnitude and shape of these interactions are fully determ…

Category: Paper