QUROPE Quantum Information Processing and Communication in Europe

Author(s): Xiaomin Liu, Feiran Cheng, and Zhengjun Xi

In this paper, we introduce an information-theoretic task that we refer to as correlated sources coding where decoders possess complementary quantum side information. We present the optimal rates for lossless correlated sources coding with both complementary and less noisy quantum side information. …

[Phys. Rev. A 110, 032433] Published Mon Sep 23, 2024

Author(s): Wenxiu Yao, Xiaoli Zhang, Long Tian, Xuan Liu, Shaoping Shi, and Yaohui Zheng

Quantum resources have been proven to drive the measurement sensitivity to beyond standard quantum limit in quantum metrology. However, quantum advantage degrades with optical losses. Aiming at angular rotation estimation, we theoretically investigate three loss-tolerant (external loss) quantum-enha…

[Phys. Rev. A 110, 032429] Published Mon Sep 23, 2024

Author(s): Maryam Mudassar, Riley W. Chien, and Daniel Gottesman

To implement a quantum error-correction protocol, we first need a scheme to prepare our state in the correct subspace of the code, and this can be done using a unitary encoding circuit. Majorana codes are special since any gates that transform such codes must preserve fermionic parity. In this paper…

[Phys. Rev. A 110, 032430] Published Mon Sep 23, 2024

Author(s): Sophia M. Walls and Ian J. Ford

We use continuous, stochastic quantum trajectories within a framework of quantum state diffusion (QSD) to describe alternating measurements of two noncommuting observables. Projective measurement of an observable completely destroys memory of the outcome of a previous measurement of the conjugate ob…

[Phys. Rev. A 110, 032432] Published Mon Sep 23, 2024

Author(s): Philip Ball

Experiments reveal the factors that determine the friction between the single-atom-thick layers in van der Waals materials, which may have uses in lubrication technology.

[Physics 17, 137] Published Fri Sep 20, 2024

Author(s): Yifan Zhang and Sarang Gopalakrishnan

Local measurements cannot create entanglement, but they can convert short-range entanglement to long-range entanglement, as in quantum teleportation. This phenomenon of measurement-induced entanglement (MIE) has been widely discussed in recent work on measurement-induced entanglement phase transitio…

[Phys. Rev. A 110, 032426] Published Fri Sep 20, 2024

Author(s): Gábor Drótos, Károly F. Pál, and Tamás Vértesi

Self-testing is a powerful method for certifying quantum systems. Initially proposed in the device-independent (DI) setting, self-testing has since been relaxed to the semi-device-independent (semi-DI) setting. In this study, we focus on the self-testing of a specific type of nonprojective qubit mea…

[Phys. Rev. A 110, 032427] Published Fri Sep 20, 2024

Author(s): Marie-Catherine Vozenin, Billy W. Loo, Jr., Sami Tantawi, Peter G. Maxim, Douglas R. Spitz, Claude Bailat, and Charles L. Limoli

Treating cancer with ionizing radiation has been pursued for nearly a century. A key challenge has been finding the right balance between providing enough dose to kill the cancer cells while minimizing the damage to normal ones. The discovery of the so-called FLASH effect, where short radiation bursts allow for higher lethal doses to be delivered to cancer cells while sparing healthy tissue, opens up the therapeutic window and ushers in a new era for radiation therapy. In this review multidisciplinary aspects are discussed of dose delivery, the chemistry and biology behind the effect, and readiness for clinical deployment.

[Rev. Mod. Phys. 96, 035002] Published Thu Sep 19, 2024

Author(s): Katherine Wright

Marie-Catherine Vozenin explains why an interdisciplinary approach is key to taking a promising experimental radiotherapy cancer treatment from the lab to the clinic.

[Physics 17, 102] Published Thu Sep 19, 2024

Author(s): Zhengzhong Yi, Zhipeng Liang, Zicheng Wang, Jiahan Chen, Chen Qiu, Yulin Wu, and Xuan Wang

Quantum stabilizer codes face the problem of low coding rate. In this article, following the idea of a recursively expanding Tanner graph proposed in our previous work, we try to construct new stabilizer codes with high coding rate, and propose an XZ-type Tanner-graph-recursive-expansion (XZ-TGRE) c…

[Phys. Rev. A 110, 032425] Published Thu Sep 19, 2024

Author(s): Ernest Y.-Z. Tan and Ramona Wolf

One of the main challenges in device-independent quantum key distribution (DIQKD) is achieving the required Bell violation over long distances, as the channel losses result in low overall detection efficiencies. Recent works have explored the concept of certifying nonlocal correlations over extended…

[Phys. Rev. Lett. 133, 120803] Published Thu Sep 19, 2024

Author(s): Xuanqiang Zhao, Xin Wang, and Giulio Chiribella

We introduce the task of shadow process simulation, where the goal is to simulate the estimation of the expectation values of arbitrary quantum observables at the output of a target physical process. When the sender and receiver share random bits or other no-signaling resources, we show that the per…

[Phys. Rev. Lett. 133, 120804] Published Thu Sep 19, 2024

Author(s): Charles Day

A one-dimensional Bose-Einstein condensate’s superfluid state is surprisingly robust if the atoms are trapped in a quasiperiodic lattice.

[Physics 17, s112] Published Thu Sep 19, 2024

Author(s): Ryan Wilkinson

A proposed experiment involving an x-ray beam and two optical beams could determine the values of fundamental constants in quantum electrodynamics.

[Physics 17, s109] Published Wed Sep 18, 2024

Author(s): Anuj K. Nayak, Eric Chitambar, and Lav R. Varshney

Quantum memory systems are vital in quantum information processing for dependable storage and retrieval of quantum states. Inspired by classical reliability theories that synthesize reliable computing systems from unreliable components, we formalize the problem of reliable storage of quantum informa…

[Phys. Rev. A 110, 032423] Published Wed Sep 18, 2024

Author(s): Mahadevan Subramanian and Sai Vinjanampathy

The task of discriminating between two known quantum channels is a well-known binary-hypothesis-testing task. We present a variational quantum algorithm with a parameterized state preparation and two-outcome positive operator-valued measure which defines the acceptance criteria for the hypothesis te…

[Phys. Rev. A 110, 032424] Published Wed Sep 18, 2024

Author(s): Hao Tang, Yu Guo, Xiao-Min Hu, Yun-Feng Huang, Bi-Heng Liu, Chuan-Feng Li, and Guang-Can Guo

The release of the causal structure of physical events from a well-defined order to an indefinite order stimulates remarkable enhancements in various quantum information tasks. Some of these advantages, however, are questioned for the ambiguous role of the control system in the quantum switch, which…

[Phys. Rev. A 110, 032422] Published Wed Sep 18, 2024

Author(s): Changhao Li, Boning Li, Omar Amer, Ruslan Shaydulin, Shouvanik Chakrabarti, Guoqing Wang, Haowei Xu, Hao Tang, Isidor Schoch, Niraj Kumar, Charles Lim, Ju Li, Paola Cappellaro, and Marco Pistoia

Distributed quantum computing is a promising computational paradigm for performing computations that are beyond the reach of individual quantum devices. Privacy in distributed quantum computing is critical for maintaining confidentiality and protecting the data in the presence of untrusted computing…

[Phys. Rev. Lett. 133, 120602] Published Wed Sep 18, 2024

Author(s): Yuguo Shao, Fuchuan Wei, Song Cheng, and Zhengwei Liu

Large-scale variational quantum algorithms are widely recognized as a potential pathway to achieve practical quantum advantages. However, the presence of quantum noise might suppress and undermine these advantages, which blurs the boundaries of classical simulability. To gain further clarity on this…

[Phys. Rev. Lett. 133, 120603] Published Wed Sep 18, 2024

Author(s): Tao Chen, Chenxi Huang, Bryce Gadway, and Jacob P. Covey

Coherent dynamics of interacting quantum particles plays a central role in the study of strongly correlated quantum matter and the pursuit of quantum information processors. Here, we present the state space of interacting Rydberg atoms as a synthetic landscape on which to control and observe coheren…

[Phys. Rev. Lett. 133, 120604] Published Wed Sep 18, 2024