QUROPE Quantum Information Processing and Communication in Europe

Author(s): Kirill Korolev

A new model, vetted by experiments on lung cancer cells, may help to explain how cancer and other diseases accumulate drug-resistance mutations that can compromise the effectiveness of treatments.

[Physics 17, 90] Published Mon Jun 03, 2024

Author(s): Robin Krebs and Mariami Gachechiladze

A deep understanding of quantum entanglement is vital for advancing quantum technologies. The strength of entanglement can be quantified by counting the degrees of freedom that are entangled, which results in a quantity called the Schmidt number. A particular challenge is to identify the strength of…

[Phys. Rev. Lett. 132, 220203] Published Fri May 31, 2024

Author(s): Vladislav Popkov, Xin Zhang, Frank Göhmann, and Andreas Klümper

We propose a qubit basis composed of transverse spin helices with kinks. Unlike the usual computational basis, this chiral basis is well-suited for describing quantum states with nontrivial topology. Choosing appropriate parameters the operators of the transverse spin components, σnx and σny, become…

[Phys. Rev. Lett. 132, 220404] Published Fri May 31, 2024

Author(s): Patrycja Łydżba, Peter Prelovšek, and Marcin Mierzejewski

Hilbert space fragmentation is an ergodicity-breaking phenomenon, in which the Hamiltonian shatters into exponentially many dynamically disconnected sectors. In many fragmented systems, these sectors can be labeled by statistically localized integrals of motion, which are nonlocal operators. We stud…

[Phys. Rev. Lett. 132, 220405] Published Fri May 31, 2024

Author(s): Irma Avdic and David A. Mazziotti

Classical shadow tomography provides a randomized scheme for approximating the quantum state and its properties at reduced computational cost with applications in quantum computing. In this Letter we present an algorithm for realizing fewer measurements in the shadow tomography of many-body systems.…

[Phys. Rev. Lett. 132, 220802] Published Fri May 31, 2024

Author(s): Elizabeth Fernandez

Experiments and theory explain how charge builds up in a moving water drop and why the effect requires a water-repelling surface.

[Physics 17, 91] Published Fri May 31, 2024

Author(s): Xian Shi

In this work, we present a coherence measure based on the quantum optimal transport cost in terms of the convex roof extended method. We also obtain the analytical solutions of the quantifier for pure states. We also propose an operational interpretation of the coherence measure for pure states.

[Phys. Rev. A 109, 052443] Published Fri May 31, 2024

Author(s): Shin-Liang Chen and Jens Eisert

We develop a framework for characterizing quantum temporal correlations in a general temporal scenario, in which an initial quantum state is measured, sent through a quantum channel, and finally measured again. This framework does not make any assumptions on the system nor on the measurements, namel…

[Phys. Rev. Lett. 132, 220201] Published Thu May 30, 2024

Author(s): Nicolò Piccione, Léa Bresque, Andrew N. Jordan, Robert S. Whitney, and Alexia Auffèves

An effective time-dependent Hamiltonian can be implemented by making a quantum system fly through an inhomogeneous potential, realizing, for example, a quantum gate on its internal degrees of freedom. However, flying systems have a spatial spread that will generically entangle the internal and spati…

[Phys. Rev. Lett. 132, 220403] Published Thu May 30, 2024

Author(s): Rachel Berkowitz

A small device senses sounds using a spiderweb-like design—a strategy that could lead to chip-size microphones that are less affected by thermal noise.

[Physics 17, 89] Published Thu May 30, 2024

Author(s): Martin Rodriguez-Vega

Experiments and numerical simulations indicate that randomly replacing a few nonmagnetic components with magnetic ones in a photonic alloy induces backscattering-free light propagation along its edge.

[Physics 17, s60] Published Thu May 30, 2024

Author(s): Christian Ufrecht, Laura S. Herzog, Daniel D. Scherer, Maniraman Periyasamy, Sebastian Rietsch, Axel Plinge, and Christopher Mutschler

Circuit cutting, the partitioning of quantum circuits into smaller independent fragments, has become a promising avenue for scaling up current quantum-computing experiments. Here, we introduce a scheme for joint cutting of two-qubit rotation gates based on a virtual gate-teleportation protocol. With…

[Phys. Rev. A 109, 052440] Published Thu May 30, 2024

Author(s): Yagnik Chatterjee, Eric Bourreau, and Marko J. Rančić

NP-hard problems are not believed to be exactly solvable through general polynomial time algorithms. Hybrid quantum-classical algorithms to address such combinatorial problems have been of great interest in the past few years. Such algorithms are heuristic in nature and aim to obtain an approximate …

[Phys. Rev. A 109, 052441] Published Thu May 30, 2024

Author(s): Bin Liu, Zhonghao Liang, Wei Huang, Fei Gao, Jiayi Yuan, and Bingjie Xu

Quantum private query (QPQ) faces many challenges in practical applications. At present, some scholars have made substantial work on overcoming channel loss, channel noise, and nonideal light sources, respectively. However, a protocol that would overcome all three of these problems has yet to materi…

[Phys. Rev. A 109, 052442] Published Thu May 30, 2024

Author(s): Yingjia Lin, Shilin Huang, and Kenneth R. Brown

For quantum error correction codes the required number of measurement rounds typically increases with the code distance when measurements are faulty. Single-shot error correction allows for an error threshold with only one round of noisy syndrome measurements regardless of the code size. Here we imp…

[Phys. Rev. A 109, 052438] Published Wed May 29, 2024

Author(s): Yuntao Tsui and Sunho Kim

The wave-particle duality, one of the expressions of Bohr complementarity, is usually quantified by path predictability and the visibility of interference fringes. With the development of quantum resource theory, quantitative analysis of wave-particle duality is increasing, most of which are express…

[Phys. Rev. A 109, 052439] Published Wed May 29, 2024

Author(s): Xiaoting Gao, Mathieu Isoard, Fengxiao Sun, Carlos E. Lopetegui, Yu Xiang, Valentina Parigi, Qiongyi He, and Mattia Walschaers

Entanglement in continuous-variable non-Gaussian states provides irreplaceable advantages in many quantum information tasks. However, the sheer amount of information in such states grows exponentially and makes a full characterization impossible. Here, we develop a neural network that allows us to u…

[Phys. Rev. Lett. 132, 220202] Published Wed May 29, 2024

Author(s): Peng Tian, Roman Riser, and Eugene Kanzieper

We introduce a notion of local level spacings and study their statistics within a random-matrix-theory approach. In the limit of infinite-dimensional random matrices, we determine universal sequences of mean local spacings and of their ratios which uniquely identify the global symmetries of a quantu…

[Phys. Rev. Lett. 132, 220401] Published Wed May 29, 2024

Author(s): Yecheng Jing, Jian-Jun Dong, Yu-Yu Zhang, and Zi-Xiang Hu

By utilizing biorthogonal bases, we develop a comprehensive framework for studying biorthogonal dynamical quantum phase transitions in non-Hermitian systems. With the help of the previously overlooked associated state, we define the automatically normalized biorthogonal Loschmidt echo. This approach…

[Phys. Rev. Lett. 132, 220402] Published Wed May 29, 2024

Author(s): X. N. Feng, M. Zhang, and L. F. Wei

Quantum entanglement and quantum squeezing are two typical approaches to beat the standard quantum limit (SQL) for the sensitive phase estimations in quantum metrology. Each of them has already been utilized individually and sequentially to improve the sensitivity of electric field sensing with the …

[Phys. Rev. Lett. 132, 220801] Published Wed May 29, 2024