Journals

Experimental Generation of Spin-Photon Entanglement in Silicon Carbide

Author(s): Ren-Zhou Fang, Xiao-Yi Lai, Tao Li, Ren-Zhu Su, Bo-Wei Lu, Chao-Wei Yang, Run-Ze Liu, Yu-Kun Qiao, Cheng Li, Zhi-Gang He, Jia Huang, Hao Li, Li-Xing You, Yong-Heng Huo, Xiao-Hui Bao, and Jian-Wei Pan

A solid-state approach for quantum networks is advantageous, as it allows the integration of nanophotonics to enhance the photon emission and the utilization of weakly coupled nuclear spins for long-lived storage. Silicon carbide, specifically point defects within it, shows great promise in this reg…


[Phys. Rev. Lett. 132, 160801] Published Mon Apr 15, 2024

Categories: Journals, Physics

Layering and subpool exploration for adaptive variational quantum eigensolvers: Reducing circuit depth, runtime, and susceptibility to noise

PRA: Quantum information - Fri, 2024-04-12 12:00

Author(s): Christopher K. Long, Kieran Dalton, Crispin H. W. Barnes, David R. M. Arvidsson-Shukur, and Normann Mertig

Adaptive variational quantum eigensolvers (ADAPT-VQEs) are promising candidates for simulations of strongly correlated systems on near-term quantum hardware. To further improve the noise resilience of these algorithms, recent efforts have been directed towards compactifying, or layering, their Ansat…


[Phys. Rev. A 109, 042413] Published Fri Apr 12, 2024

Categories: Journals, Physics

Embedding Quantum Many-Body Scars into Decoherence-Free Subspaces

Author(s): He-Ran Wang, Dong Yuan, Shun-Yao Zhang, Zhong Wang, Dong-Ling Deng, and L.-M. Duan

Quantum many-body scars are nonthermal excited eigenstates of nonintegrable Hamiltonians, which could support coherent revival dynamics from special initial states when scars form an equally spaced tower in the energy spectrum. For open quantum systems, engineering many-body scarred dynamics by a co…


[Phys. Rev. Lett. 132, 150401] Published Fri Apr 12, 2024

Categories: Journals, Physics

Autonomous Quantum Error Correction of Gottesman-Kitaev-Preskill States

Author(s): Dany Lachance-Quirion, Marc-Antoine Lemonde, Jean Olivier Simoneau, Lucas St-Jean, Pascal Lemieux, Sara Turcotte, Wyatt Wright, Amélie Lacroix, Joëlle Fréchette-Viens, Ross Shillito, Florian Hopfmueller, Maxime Tremblay, Nicholas E. Frattini, Julien Camirand Lemyre, and Philippe St-Jean

The Gottesman-Kitaev-Preskill (GKP) code encodes a logical qubit into a bosonic system with resilience against single-photon loss, the predominant error in most bosonic systems. Here we present experimental results demonstrating quantum error correction of GKP states based on reservoir engineering o…


[Phys. Rev. Lett. 132, 150607] Published Fri Apr 12, 2024

Categories: Journals, Physics

Better performance of quantum batteries in different environments compared to closed batteries

PRA: Quantum information - Thu, 2024-04-11 12:00

Author(s): Shu-Qian Liu, Lu Wang, Hao Fan, Feng-Lin Wu, and Si-Yuan Liu

We construct a central-spin battery model affected by noise or thermal bath and consider the impact of environment on battery performance. In a noisy environment, we show that the steady-state energy and ergotropy are related to the number of spins exposed to the noisy channel. In addition, we revea…


[Phys. Rev. A 109, 042411] Published Thu Apr 11, 2024

Categories: Journals, Physics

Adaptive Bayesian quantum algorithm for phase estimation

PRA: Quantum information - Thu, 2024-04-11 12:00

Author(s): Joseph G. Smith, Crispin H. W. Barnes, and David R. M. Arvidsson-Shukur

Quantum-phase-estimation algorithms are critical subroutines in many applications for quantum computers and in quantum-metrology protocols. These algorithms estimate the unknown strength of a unitary evolution. By using coherence or entanglement to sample the unitary Ntot times, the variance of the …


[Phys. Rev. A 109, 042412] Published Thu Apr 11, 2024

Categories: Journals, Physics

Fine-Structure Qubit Encoded in Metastable Strontium Trapped in an Optical Lattice

Author(s): S. Pucher, V. Klüsener, F. Spriestersbach, J. Geiger, A. Schindewolf, I. Bloch, and S. Blatt

We demonstrate coherent control of the fine-structure qubit in neutral strontium atoms. This qubit is encoded in the metastable P23 and P03 states, coupled by a Raman transition. Using a magnetic quadrupole transition, we demonstrate coherent state initialization of this THz qubit. We show Rabi osci…


[Phys. Rev. Lett. 132, 150605] Published Thu Apr 11, 2024

Categories: Journals, Physics

Coherent Control of the Fine-Structure Qubit in a Single Alkaline-Earth Atom

Author(s): G. Unnikrishnan, P. Ilzhöfer, A. Scholz, C. Hölzl, A. Götzelmann, R. K. Gupta, J. Zhao, J. Krauter, S. Weber, N. Makki, H. P. Büchler, T. Pfau, and F. Meinert

We report on the first realization of a novel neutral atom qubit encoded in the spin-orbit coupled metastable states P03 and P23 of a single Sr88 atom trapped in an optical tweezer. Raman coupling of the qubit states promises rapid single-qubit rotations on par with the fast Rydberg-mediated two-bod…


[Phys. Rev. Lett. 132, 150606] Published Thu Apr 11, 2024

Categories: Journals, Physics

Terahertz-mediated microwave-to-optical transduction

PRA: Quantum information - Wed, 2024-04-10 12:00

Author(s): Furkan Sahbaz, James N. Eckstein, Dale J. Van Harlingen, and Simeon I. Bogdanov

Transduction of quantum signals between the microwave and the optical ranges will unlock powerful hybrid quantum systems enabling information processing with superconducting qubits and low-noise quantum networking through optical photons. Most microwave-to-optical quantum transducers suffer from the…


[Phys. Rev. A 109, 042409] Published Wed Apr 10, 2024

Categories: Journals, Physics

Robustness of chaotic behavior in iterated quantum protocols

PRA: Quantum information - Wed, 2024-04-10 12:00

Author(s): Attila Portik, Orsolya Kálmán, Igor Jex, and Tamás Kiss

One of the simplest possible quantum circuits, consisting of a cnot gate, a Hadamard gate, and a measurement on one of the outputs is known to lead to chaotic dynamics when applied iteratively on an ensemble of equally prepared qubits. The evolution of pure initial quantum states is characterized by…


[Phys. Rev. A 109, 042410] Published Wed Apr 10, 2024

Categories: Journals, Physics

Verifiable Blind Quantum Computing with Trapped Ions and Single Photons

Author(s): P. Drmota, D. P. Nadlinger, D. Main, B. C. Nichol, E. M. Ainley, D. Leichtle, A. Mantri, E. Kashefi, R. Srinivas, G. Araneda, C. J. Ballance, and D. M. Lucas

A trapped-ion quantum server and a photonic client-side system are linked by fiber optics to implement a protocol for secure cloud-based quantum computation.


[Phys. Rev. Lett. 132, 150604] Published Wed Apr 10, 2024

Categories: Journals, Physics

Achieving metrological limits using ancilla-free quantum error-correcting codes

PRA: Quantum information - Tue, 2024-04-09 12:00

Author(s): Sisi Zhou, Argyris Giannisis Manes, and Liang Jiang

Quantum error correction (QEC) is theoretically capable of achieving the ultimate estimation limits in noisy quantum metrology. However, existing quantum error-correcting codes designed for noisy quantum metrology generally exploit entanglement between one probe and one noiseless ancilla of the same…


[Phys. Rev. A 109, 042406] Published Tue Apr 09, 2024

Categories: Journals, Physics

Quantum change point and entanglement distillation

PRA: Quantum information - Tue, 2024-04-09 12:00

Author(s): Abhishek Banerjee, Pratapaditya Bej, and Somshubhro Bandyopadhyay

In a quantum change point problem, a source emitting particles in a fixed quantum state (default) switches to a different state at some stage, and the objective is to identify when the change happened by measuring a sequence of particles emitted from such a source. Motivated by entanglement-sharing …


[Phys. Rev. A 109, 042407] Published Tue Apr 09, 2024

Categories: Journals, Physics

Incorporating encoding into quantum system design

PRA: Quantum information - Tue, 2024-04-09 12:00

Author(s): Alastair Kay

When creating a quantum system whose natural dynamics provide useful computational operations, designers have two key tools at their disposal: the (constrained) choice of both the Hamiltonian and the the initial state of the system (an encoding). Typically, we fix the design and utilize encodings po…


[Phys. Rev. A 109, 042408] Published Tue Apr 09, 2024

Categories: Journals, Physics

Absence of Barren Plateaus in Finite Local-Depth Circuits with Long-Range Entanglement

Author(s): Hao-Kai Zhang, Shuo Liu, and Shi-Xin Zhang

Ground state preparation is classically intractable for general Hamiltonians. On quantum devices, shallow parametrized circuits can be effectively trained to obtain short-range entangled states under the paradigm of variational quantum eigensolver, while deep circuits are generally untrainable due t…


[Phys. Rev. Lett. 132, 150603] Published Tue Apr 09, 2024

Categories: Journals, Physics

Robustness- and weight-based resource measures without convexity restriction: Multicopy witness and operational advantage in static and dynamical quantum resource theories

PRA: Quantum information - Mon, 2024-04-08 12:00

Author(s): Kohdai Kuroiwa, Ryuji Takagi, Gerardo Adesso, and Hayata Yamasaki

Quantum resource theories (QRTs) provide a unified framework to analyze quantum properties as resources for achieving advantages in quantum information processing. The generalized robustness and the weight of resource have been gaining increasing attention as useful resource quantifiers. However, th…


[Phys. Rev. A 109, 042403] Published Mon Apr 08, 2024

Categories: Journals, Physics

Bounds on Rényi entropy growth in many-body quantum systems

PRA: Quantum information - Mon, 2024-04-08 12:00

Author(s): Zhengyan Darius Shi

We prove rigorous bounds on the growth of α-Rényi entropies Sα(t) (the von Neumann entropy being the special case α=1) associated with any subsystem A of a general lattice quantum many-body system with finite on-site Hilbert space dimension. For completely nonlocal Hamiltonians, we show that the ins…


[Phys. Rev. A 109, 042404] Published Mon Apr 08, 2024

Categories: Journals, Physics

Shortest evolution path between two mixed states and its realization

PRA: Quantum information - Mon, 2024-04-08 12:00

Author(s): Jie-Hui Huang, Shan-Shan Dong, Guang-Long Chen, Nan-Run Zhou, Fu-Yao Liu, and Li-Guo Qin

In a quantum unitary system, an initial state may have different paths to evolve to a target state, and the only requirement is that the initial and target states share the same eigenvalue spectrum. We focus on the evolution between two nondegenerate mixed states in this paper, and investigate the s…


[Phys. Rev. A 109, 042405] Published Mon Apr 08, 2024

Categories: Journals, Physics

Every Quantum Helps: Operational Advantage of Quantum Resources beyond Convexity

Author(s): Kohdai Kuroiwa, Ryuji Takagi, Gerardo Adesso, and Hayata Yamasaki

Identifying what quantum-mechanical properties are useful to untap a superior performance in quantum technologies is a pivotal question. Quantum resource theories provide a unified framework to analyze and understand such properties, as successfully demonstrated for entanglement and coherence. While…


[Phys. Rev. Lett. 132, 150201] Published Mon Apr 08, 2024

Categories: Journals, Physics

On-Chip Quantum Information Processing with Distinguishable Photons

Author(s): Patrick Yard, Alex E. Jones, Stefano Paesani, Alexandre Maïnos, Jacob F. F. Bulmer, and Anthony Laing

Multiphoton interference is at the heart of photonic quantum technologies. Arrays of integrated cavities can support bright sources of single photons with high purity and small footprint, but the inevitable spectral distinguishability between photons generated from nonidentical cavities is an obstac…


[Phys. Rev. Lett. 132, 150602] Published Mon Apr 08, 2024

Categories: Journals, Physics
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