Feed aggregator

One-shot and asymptotic classical capacity in general physical theories

PRA: Quantum information - Tue, 2024-06-11 12:00

Author(s): Shintaro Minagawa and Hayato Arai

With the recent development of quantum information theory, some attempts have been made to construct information theory beyond quantum theory. Here, we consider hypothesis-testing relative entropy and one-shot classical capacity, that is, the optimal rate of classical information transmitted by usin…

[Phys. Rev. A 109, 062416] Published Tue Jun 11, 2024

Categories: Journals, Physics

Measurement-Based Infused Circuits for Variational Quantum Eigensolvers

Author(s): Albie Chan, Zheng Shi, Luca Dellantonio, Wolfgang Dür, and Christine A. Muschik

Variational quantum eigensolvers (VQEs) are successful algorithms for studying physical systems on quantum computers. Recently, they were extended to the measurement-based model of quantum computing, bringing resource graph states and their advantages into the realm of quantum simulation. In this Le…

[Phys. Rev. Lett. 132, 240601] Published Tue Jun 11, 2024

Categories: Journals, Physics

Certifying Network Topologies and Nonlocalities of Triangle Quantum Networks

Author(s): Ya-Li Mao, Hu Chen, Bixiang Guo, Shiting Liu, Zheng-Da Li, Ming-Xing Luo, and Jingyun Fan

Quantum networks promise unprecedented advantages in information processing and open up intriguing new opportunities in fundamental research, where network topology and network nonlocality fundamentally underlie these applications. Hence, the detections of network topology and nonlocality are crucia…

[Phys. Rev. Lett. 132, 240801] Published Tue Jun 11, 2024

Categories: Journals, Physics

Certifying the Topology of Quantum Networks: Theory and Experiment

Author(s): Lisa T. Weinbrenner, Nidhin Prasannan, Kiara Hansenne, Sophia Denker, Jan Sperling, Benjamin Brecht, Christine Silberhorn, and Otfried Gühne

Distributed quantum information in networks is paramount for global secure quantum communication. Moreover, it finds applications as a resource for relevant tasks, such as clock synchronization, magnetic field sensing, and blind quantum computation. For quantum network analysis and benchmarking of i…

[Phys. Rev. Lett. 132, 240802] Published Tue Jun 11, 2024

Categories: Journals, Physics

Extending the Kibble-Zurek Mechanism

APS Physics - Tue, 2024-06-11 12:00

Author(s): Charles Day

A theory first applied to phase transitions in the early Universe and then to defects in superfluid helium can now account for a wider variety of systems.

[Physics 17, s61] Published Tue Jun 11, 2024

Categories: Physics

All-optical correlated noisy channel and its application in recovering quantum coherence

PRA: Quantum information - Mon, 2024-06-10 12:00

Author(s): Dan Lei, Disheng Guo, Jun Xin, and Xiao-Ming Lu

Attenuation and amplification are the most common processes for optical communications. Amplification can be used to compensate the attenuation of the complex amplitude of an optical field, but is unable to recover the coherence lost, provided that the attenuation channel and the amplification chann…

[Phys. Rev. A 109, 062410] Published Mon Jun 10, 2024

Categories: Journals, Physics

Concatenating quantum error-correcting codes with decoherence-free subspaces and vice versa

PRA: Quantum information - Mon, 2024-06-10 12:00

Author(s): Nihar Ranjan Dash, Sanjoy Dutta, R. Srikanth, and Subhashish Banerjee

Quantum error-correcting codes (QECCs) and decoherence-free subspace (DFS) codes provide active and passive means, respectively, to address certain types of errors that arise during quantum computation. The latter technique is suitable to correct correlated errors with certain symmetries and the for…

[Phys. Rev. A 109, 062411] Published Mon Jun 10, 2024

Categories: Journals, Physics

Enhanced observable estimation through classical optimization of informationally overcomplete measurement data: Beyond classical shadows

PRA: Quantum information - Mon, 2024-06-10 12:00

Author(s): Joonas Malmi, Keijo Korhonen, Daniel Cavalcanti, and Guillermo García-Pérez

In recent years, informationally complete measurements have attracted considerable attention, especially in the context of classical shadows. In the particular case of informationally overcomplete measurements, for which the number of possible outcomes exceeds the dimension of the space of linear op…

[Phys. Rev. A 109, 062412] Published Mon Jun 10, 2024

Categories: Journals, Physics

A Close Look at the Dynamics of an Ion–Neutral Reaction

APS Physics - Mon, 2024-06-10 12:00

Author(s): Valentina Zhelyazkova

A detailed study of a reaction between a molecular ion and a neutral atom has implications for both atmospheric and interstellar chemistry.

[Physics 17, 93] Published Mon Jun 10, 2024

Categories: Physics

Hexapartite coherent feedback control in four-wave mixing with a spatially structured pump

PRA: Quantum information - Fri, 2024-06-07 12:00

Author(s): Haiyan He, Kai Zhang, and Jietai Jing

Quantum coherent feedback control (CFC) has been widely applied to prepare and manipulate nonclassical beams. In this paper, we utilize an optical beam splitter with tunable reflectivity k as a feedback controller and theoretically construct a CFC system based on four-wave mixing (FWM) processes wit…

[Phys. Rev. A 109, 062409] Published Fri Jun 07, 2024

Categories: Journals, Physics

Nonmesonic Quantum Many-Body Scars in a 1D Lattice Gauge Theory

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

Categories: Journals, Physics

Quantum Speed Limit for States and Observables of Perturbed Open Systems

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

Categories: Journals, Physics

Deterministic Preparation of Optical Squeezed Cat and Gottesman-Kitaev-Preskill States

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

Categories: Journals, Physics

Theory Predicts Collective States of Mobile Particles

APS Physics - Fri, 2024-06-07 12:00

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

Categories: Physics

Quantum multigraph states and multihypergraph states

PRA: Quantum information - Thu, 2024-06-06 12:00

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

Categories: Journals, Physics

Beating one bit of communication with quantum correlations in smaller dimensions

PRA: Quantum information - Thu, 2024-06-06 12:00

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

Categories: Journals, Physics

Colorful Primordial Black Holes

APS Physics - Thu, 2024-06-06 12:00

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

Categories: Physics

Fluorescence microscopy: A statistics-optics perspective

Reviews of Modern Physics - Wed, 2024-06-05 12:00

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

Categories: Journals, Physics

A Simple Electronic Circuit Manifests a Complex Physical Effect

APS Physics - Wed, 2024-06-05 12:00

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

Categories: Physics

Antiferromagnetic Bosonic $t\mathbit{–}J$ Models and Their Quantum Simulation in Tweezer Arrays

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

Categories: Journals, Physics
Syndicate content