QUROPE Quantum Information Processing and Communication in Europe

Author(s): Zi-Yong Ge, Yu-Ran Zhang, and Franco Nori

We investigate the meson excitations (particle-antiparticle bound states) in quantum many-body scars of a 1D Z2 lattice gauge theory coupled to a dynamical spin-12 chain as a matter field. By introducing a string representation of the physical Hilbert space, we express a scar state |Ψn,l⟩ as a super…

[Phys. Rev. Lett. 132, 230403] Published Fri Jun 07, 2024

Author(s): Benjamin Yadin, Satoya Imai, and Otfried Gühne

Quantum speed limits provide upper bounds on the rate with which a quantum system can move away from its initial state. Here, we provide a different kind of speed limit, describing the divergence of a perturbed open system from its unperturbed trajectory. In the case of weak coupling, we show that t…

[Phys. Rev. Lett. 132, 230404] Published Fri Jun 07, 2024

Author(s): Matthew S. Winnel, Joshua J. Guanzon, Deepesh Singh, and Timothy C. Ralph

Large-amplitude squeezed cat states and high-quality Gottesman-Kitaev-Preskill (GKP) states are essential for effective quantum error correction, yet their optical preparation has been hindered by challenges such as low success probabilities, small amplitudes, and insufficient squeezing. Addressing …

[Phys. Rev. Lett. 132, 230602] Published Fri Jun 07, 2024

Author(s): Mark Buchanan

Collections of interacting self-propelled objects held rigidly together show patterns of organized behavior that can be predicted.

[Physics 17, 94] Published Fri Jun 07, 2024

Author(s): Xiao-Dong Zhang, Bin-Bin Cai, and Song Lin

In this paper we propose two classes of multiparticle entangled states: multigraph and multihypergraph states. Two types of operations are designed to correspond to the edges and hyperedges to prepare the states. Furthermore, multigraph and multihypergraph states contain qudit graph and hypergraph s…

[Phys. Rev. A 109, 062407] Published Thu Jun 06, 2024

Author(s): Peter Sidajaya and Valerio Scarani

As a consequence of Bell's theorem, the statistics of measurements on some entangled states cannot be simulated with local hidden variables alone. The amount of communication that must be supplied is an intuitive quantifier of nonclassicality. While it is obvious that this amount can be very large i…

[Phys. Rev. A 109, 062408] Published Thu Jun 06, 2024

Author(s): Matteo Rini

Some ultralight black holes that formed soon after the big bang might have been exotic objects with a net “color charge” that left potentially observable signatures.

[Physics 17, s69] Published Thu Jun 06, 2024

Author(s): Mohamadreza Fazel, Kristin S. Grussmayer, Boris Ferdman, Aleksandra Radenovic, Yoav Shechtman, Jörg Enderlein, and Steve Pressé

For centuries, human fascination with the living world motivated the development of tools for visualizing life’s events at the spatiotemporal scales beyond our visual range. While all optical microscopes use light to probe the object of interest, fluorescence microscopes can discern between the object and background at the molecular scale. At this scale, the stochastic properties of light are fundamental to interpreting fluorescence microscopy data. Accordingly quantitative methods that enable such interpretation necessitate stochastic perspective and the use of statistical concepts. The physical-optical principles governing the formation of fluorescent images and modeling tools interpreting these images while accounting for the stochasticity of light and measurements are reviewed.

[Rev. Mod. Phys. 96, 025003] Published Wed Jun 05, 2024

Author(s): Charles Day

Using a single set of measurements of an electronic circuit, researchers have characterized the properties of the topologically protected edge states of a quantum Hall system.

[Physics 17, s63] Published Wed Jun 05, 2024

Author(s): Lukas Homeier, Timothy J. Harris, Tizian Blatz, Sebastian Geier, Simon Hollerith, Ulrich Schollwöck, Fabian Grusdt, and Annabelle Bohrdt

The combination of optical tweezer arrays with strong interactions—via dipole exchange of molecules and Van der Waals interactions of Rydberg atoms—has opened the door for the exploration of a wide variety of quantum spin models. A next significant step will be the combination of such settings with …

[Phys. Rev. Lett. 132, 230401] Published Tue Jun 04, 2024

Author(s): Iris Ulčakar and Zala Lenarčič

Integrable systems offer rare examples of solvable many-body problems in the quantum world. Because of the fine-tuned structure, their realization in nature and experiment is never completely accurate, and therefore effects of integrability are observed only transiently. One way to overcome this lim…

[Phys. Rev. Lett. 132, 230402] Published Tue Jun 04, 2024

Author(s): Andrea Parlangeli

Using an atomic array originally designed for quantum memory, researchers have demonstrated a magnetometer with unprecedented spatial resolution.

[Physics 17, 92] Published Tue Jun 04, 2024

Author(s): Marric Stephens

Statistical properties of fluctuations of certain parameters describing a complex system can reveal when that system is approaching a tipping point.

[Physics 17, s64] Published Tue Jun 04, 2024

Author(s): Guilherme Zambon and Diogo O. Soares-Pinto

In the dynamics of open quantum systems, information may propagate in time through either the system or the environment, giving rise to Markovian and non-Markovian temporal correlations, respectively. However, despite their notable coexistence in most physical situations, it is not yet clear how the…

[Phys. Rev. A 109, 062401] Published Mon Jun 03, 2024

Author(s): G.-X. Wang, Y.-K. Wu, R. Yao, W.-Q. Lian, Z.-J. Cheng, Y.-L. Xu, C. Zhang, Y. Jiang, Y.-Z. Xu, B.-X. Qi, P.-Y. Hou, Z.-C. Zhou, L. He, and L.-M. Duan

The spin-boson model is a prototypical model for open quantum dynamics. Here we simulate the spin-boson model using a chain of trapped ions in which a spin is coupled to a structured reservoir of bosonic modes. We engineer the spectral density of the reservoir by adjusting the ion number, the target…

[Phys. Rev. A 109, 062402] Published Mon Jun 03, 2024

Author(s): Minjin Choi, Jeonghyeon Shin, Gunho Lee, and Eunok Bae

Quantum teleportation is an essential application of quantum entanglement. The examination of teleportation fidelity in two-party standard teleportation schemes reveals a critical threshold distinguishing separable and entangled states. For separable states, their teleportation fidelities cannot exc…

[Phys. Rev. A 109, 062403] Published Mon Jun 03, 2024

Author(s): Ruidi Zhu, Ciara Pike-Burke, and Florian Mintert

The experimental evaluation of many quantum mechanical quantities requires the estimation of several directly measurable observables, such as local observables. Due to the necessity to repeat experiments on individual quantum systems in order to estimate expectation values of observables, the questi…

[Phys. Rev. A 109, 062404] Published Mon Jun 03, 2024

Author(s): Agung Budiyono

Kirkwood-Dirac (KD) quasiprobability is a quantum analog of classical phase space probability. It offers an informationally complete representation of quantum state wherein the quantumness associated with quantum noncommutativity manifests in its nonclassical values, i.e., the nonreal and/or negativ…

[Phys. Rev. A 109, 062405] Published Mon Jun 03, 2024

Author(s): Yu Wang and Wei Cui

Classical shadow tomography, harnessing randomized informationally complete (IC) measurements, provides an effective avenue for predicting many properties of unknown quantum states. In n-qubit systems, projections onto 2n+1 mutually unbiased bases (MUBs) are widely recognized as minimal and optimal …

[Phys. Rev. A 109, 062406] Published Mon Jun 03, 2024

Author(s): Tenghui Wang, Feng Wu, Fei Wang, Xizheng Ma, Gengyan Zhang, Jianjun Chen, Hao Deng, Ran Gao, Ruizi Hu, Lu Ma, Zhijun Song, Tian Xia, Make Ying, Huijuan Zhan, Hui-Hai Zhao, and Chunqing Deng

Fast and high-fidelity qubit initialization is crucial for low-frequency qubits such as fluxonium, and in applications of many quantum algorithms and quantum error correction codes. In a circuit quantum electrodynamics system, the initialization is typically achieved by transferring the state betwee…

[Phys. Rev. Lett. 132, 230601] Published Mon Jun 03, 2024