Observation of Topological Magnon Insulator States in a Superconducting Circuit

Cai, Wenli; Han, Jie; Mei, Feng; Xu, Yong; Ma, Yuxin; Li, X.; Wang, H.; Song, Yipu; Xue, Zheng‐Yuan; Yin, Zhang-qi; Jia, Suotang; Sun, Luyan

doi:10.1103/physrevlett.123.080501

Cited by 110 publications

(64 citation statements)

References 54 publications

(51 reference statements)

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“…Topological phases of matter have attracted great interests and developed potential applications in quantum physics [1][2][3][4][5][6][7][8][9]. In particular, topological insulators possess topologically protected surface or edge states, robust to local disorders.…”

Section: Introductionmentioning

confidence: 99%

Simulation of topological phases with color center arrays in phononic crystals

2020

Phys. Rev. Research

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We propose an efficient scheme for simulating the topological phases of matter based on siliconvacancy (SiV) center arrays in phononic crystals. This phononic band gap structure allows for long-range spin-spin interactions with a tunable profile. Under a particular periodic microwave driving, the band-gap mediated spin-spin interaction can be further designed with the form of the Su-Schrieffer-Heeger (SSH) Hamiltonian. In momentum space, we investigate the topological characters of the SSH model, and show that the topological nontrivial phase can be obtained through modulating the periodic driving fields. Furthermore, we explore the zero-energy topological edge states at the boundary of the color center arrays, and study the robust quantum information transfer via the topological edge states. This setup provides a scalable and promising platform for studying topological quantum physics and quantum information processing with color centers and phononic crystals.

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Section: Introductionmentioning

confidence: 99%

Simulation of topological phases with color center arrays in phononic crystals

2020

Phys. Rev. Research

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“…The key of Floquet engineering is designing appropriate driving schemes to synthesize the target Hamiltonian. In superconducting qubits, Floquet engineering has been used to realize chiral ground state current 13 , quantum switch 14 , perfect state transfer 15 , Dzyaloshinskii-Moriya (DM) interaction 16 , and topological magnon insulator states 17 . Although it has been proven in theory that arbitrary two-body spin intera) W. L. and W. F. contributed equally to this work.…”

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confidence: 99%

Synthesizing three-body interaction of spin chirality with superconducting qubits

Liu

Feng

Ren

et al. 2020

Applied Physics Letters

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Superconducting qubits provide a competitive platform for quantum simulation of complex dynamics that lies at the heart of quantum many-body systems, because of the flexibility and scalability afforded by the nature of microfabrication. However, in a multiqubit device, the physical form of couplings between qubits is either an electric (capacitor) or magnetic field (inductor), and the associated quadratic field energy determines that only two-body interaction in the Hamiltonian can be directly realized. Here we propose and experimentally synthesize the three-body spin-chirality interaction in a superconducting circuit based on Floquet engineering. By periodically modulating the resonant frequencies of the qubits connected with each other via capacitors, we can dynamically turn on and off qubit-qubit couplings, and further create chiral flows of the excitations in the three-qubit circular loop. Our result is a step toward engineering dynamical and many-body interactions in multiqubit superconducting devices, which potentially expands the degree of freedom in quantum simulation tasks.

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“…In this work, we study the interaction between a microwave cavity and the topological matter of a superconducting qubit array, described by the Su-Schrieffer-Heeger (SSH) Hamiltonian [47] which has been experimentally realized in a periodic driving way [48]. Different from the electronic transport detections of Majorana fermions [13,[49][50][51], the cavity spectroscopy method we study here unveils the edge states and topological phase transition with proper cavity-qubit couplings.…”

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confidence: 99%

“…The cavityqubits couplings we choose here allow the observation of topological phase transition. In superconducting qubit circuits, topological phases have recently been demonstrated experimentally [48,[58][59][60][61][62][63][64][65]. However, the quantum operations on topological states have not been implemented.…”

mentioning

confidence: 99%

Bandgap-assisted quantum control of topological edge states in a cavity

Nie

Liu

2020

Phys. Rev. Research

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Quantum matter with exotic topological order has potential applications in quantum computation. However, in present experiments, the manipulations on topological states are still challenging. We here propose an architecture for quantum control of topological matter. We consider a topological superconducting qubit array with Su-Schrieffer-Heeger (SSH) Hamiltonian which couples to a microwave cavity. The light-matter interactions are analyzed by exploiting topological bandgap in the qubit array. With proper cavity-qubits couplings, edge states and topological phase transition can be spectroscopically probed by the cavity. And the reflection spectrum shows a signature of vacuum Rabi splitting for edge states. Moreover, with the protection of topological bandgap, cavity induces nonlocal interaction between edge states. Quantum interference of emissions from two edge states is discussed. Our work may pave a way for topological quantum state engineering.

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Observation of Topological Magnon Insulator States in a Superconducting Circuit

Cited by 110 publications

References 54 publications

Simulation of topological phases with color center arrays in phononic crystals

Simulation of topological phases with color center arrays in phononic crystals

Synthesizing three-body interaction of spin chirality with superconducting qubits

Bandgap-assisted quantum control of topological edge states in a cavity

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