Coupling spin ensembles via superconducting flux qubits

Qiu, Yan‐Qun; Xiong, Wei; Tian, Lin; You, J. Q.

doi:10.1103/physreva.89.042321

Cited by 36 publications

(34 citation statements)

References 52 publications

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“…Especially, the combination of different systems with optimized coherent and tailored (engineered) dissipative properties may be used to investigate issues related to nonequilibrium phase transitions in open quantum many-body systems (10,(112)(113)(114). Such systems are currently difficult to realize in the laboratory, but analyses of dissipative Dicketype lattice models with HQS arrays of spin ensembles and superconducting circuits (115)(116)(117)(118) show the potential for achieving scalable systems with sufficiently large interaction strengths.…”

Section: Atomic Ensembles As Memories Andmentioning

confidence: 99%

Quantum technologies with hybrid systems

Kurizki

Bertet

Kubo

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

753

628

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An extensively pursued current direction of research in physics aims at the development of practical technologies that exploit the effects of quantum mechanics. As part of this ongoing effort, devices for quantum information processing, secure communication, and high-precision sensing are being implemented with diverse systems, ranging from photons, atoms, and spins to mesoscopic superconducting and nanomechanical structures. Their physical properties make some of these systems better suited than others for specific tasks; thus, photons are well suited for transmitting quantum information, weakly interacting spins can serve as long-lived quantum memories, and superconducting elements can rapidly process information encoded in their quantum states. A central goal of the envisaged quantum technologies is to develop devices that can simultaneously perform several of these tasks, namely, reliably store, process, and transmit quantum information. Hybrid quantum systems composed of different physical components with complementary functionalities may provide precisely such multitasking capabilities. This article reviews some of the driving theoretical ideas and first experimental realizations of hybrid quantum systems and the opportunities and challenges they present and offers a glance at the near-and long-term perspectives of this fascinating and rapidly expanding field.hybrid quantum systems | quantum technologies | quantum information During the last several decades, quantum physics has evolved from being primarily the conceptual framework for the description of microscopic phenomena to providing inspiration for new technological applications. A range of ideas for quantum information processing (1) and secure communication (2, 3), quantum enhanced sensing (4-8), and the simulation of complex dynamics (9-14) has given rise to expectations that society may before long benefit from such quantum technologies. These developments are driven by our rapidly evolving abilities to experimentally manipulate and control quantum dynamics in diverse systems, ranging from single photons (2, 13), atoms and ions (11,12), and individual electron and nuclear spins (15-17), to mesoscopic superconducting (14, 18) and nanomechanical devices (19,20). As a rule, each of these systems can execute one or a few specific tasks, but no single system can be universally suitable for all envisioned applications. Thus, photons are best suited for transmitting quantum information, weakly interacting spins may serve as long-lived quantum memories, and the dynamics of electronic states of atoms or electric charges in semiconductors and superconducting elements may realize rapid processing of information encoded in their quantum states. The implementation of devices that can simultaneously perform several or all of these tasks, e.g., reliably store, process, and transmit quantum states, calls for a new paradigm: that of hybrid quantum systems (HQSs) (15, 21-24). HQSs attain their multitasking capabilities by combining different physical components wit...

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Section: Atomic Ensembles As Memories Andmentioning

confidence: 99%

Quantum technologies with hybrid systems

Kurizki

Bertet

Kubo

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

753

628

View full text Add to dashboard Cite

show abstract

“…The nonequilibrium dynamics of the cavity polaritons in this setup can also be investigated. We would like to mention that interconnected qubit-resonator arrays with uniform or opposite couplings were studied in previous works that focus on effective resonator coupling and quantum magnetism [53][54][55] . While our focus here is to study quantum phase transition caused by the interplay of the qubit-resonator couplings, which is distinctively different from that of the previous works.…”

Section: Introductionmentioning

confidence: 99%

Quantum phase transition in a multiconnected superconducting Jaynes-Cummings lattice

Seo

Tian

2015

Phys. Rev. B

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The connectivity and tunability of superconducting qubits and resonators provide us with an appealing platform to study the many-body physics of microwave excitations. Here we present a multi-connected JaynesCummings lattice model which is symmetric with respect to the nonlocal qubit-resonator couplings. Our calculation shows that this model exhibits a Mott insulator-superfluid-Mott insulator phase transition at commensurate fillings, featured by symmetric quantum critical points. Phase diagrams in the grand canonical ensemble are also derived, which confirm the incompressibility of the Mott insulator phase. Different from a general-purposed quantum computer, it only requires two operations to demonstrate this phase transition: the preparation and the detection of commensurate many-body ground state. We discuss the realization of these operations in a superconducting circuit.

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“…Among various hybrid systems, the nitrogen-vacancy (NV) center in a diamond coupled to a superconducting circuit has attracted special attention (see, e.g. [3][4][5][6][7][8][9][10][11]), because it has distinct advantages, such as high tunability, long coherence time, and stable energy levels. In addition, superconducting circuits exhibit macroscopic quantum coherence, promise good scalability, and can be conveniently controlled and manipulated via external fields (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

Amplification of the coupling strength in a hybrid quantum system

Xiong

Qiu

et al. 2018

New J. Phys.

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Realization of strong coupling between two different quantum systems is important for fast transferring quantum information between them, but its implementation is difficult in some hybrid quantum systems. Here we propose a scheme to enhance the coupling strength between a single nitrogen-vacancy center and a superconducting circuit via squeezing. The main recipe of our scheme is to construct a unitary squeezing transformation by directly tuning the specifically-designed superconducting circuit. Using the experimentally accessible parameters of the circuit, we find that the coupling strength can be largely amplified by applying the squeezing transformations to the system. This provides a new path to enhance the coupling strengths in hybrid quantum systems.

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Coupling spin ensembles via superconducting flux qubits

Cited by 36 publications

References 52 publications

Quantum technologies with hybrid systems

Quantum technologies with hybrid systems

Quantum phase transition in a multiconnected superconducting Jaynes-Cummings lattice

Amplification of the coupling strength in a hybrid quantum system

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