Fluxonium: An Alternative Qubit Platform for High-Fidelity Operations

Bao, Feng; Deng, Hao; Ding, Dawei; Gao, Ran; Gao, Xun; Huang, Cupjin; Xun, Jiang; Ku, Hsiang‐Sheng; Li, Zhisheng; Ma, Xizheng; Ni, Xiaotong; Qin, Jin; Song, Zhijun; Sun, Hantao; Tang, Chengchun; Wang, Tenghui; Wu, Fuying; Xia, Tongsheng; Yu, Wenlong; Zhang, Fang; Zhang, Gengyan; Zhang, Xiaohang; Zhang, Jingwei; Zhu, Xing; Shi, Yuanming; Chen, Jianxin; Zhao, Hui‐Hai; Deng, Chunqing

doi:10.1103/physrevlett.129.010502

Cited by 65 publications

(27 citation statements)

References 57 publications

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“…( 20) in terms of α, β and γ are specified below. The relationship (20) provides an explicit recipe for constructing a √ iSWAP gate, given a √ φSWAP gate and arbitrary single-qubit Z rotations. Quantum algorithms are typically written in terms of named gates like √ iSWAP [58], as opposed to the native gate √ φSWAP achieved here.…”

Section: Two-qubit Entangling Gatementioning

confidence: 99%

“…Motivated by the hundreds of microseconds [8,16] to millisecond [17] coherence times recently observed in low-frequency fluxonium qubits, we apply this analysis to a coupled system of such fluxonia. Two-qubit gates on capacitively-coupled fluxonia have recently been reported [3,[18][19][20][21], with infidelities on the order of 10 −2 − 10 −3 . These experimental realizations have been accompanied by a flurry of theoretical attention [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Fast high-fidelity gates for galvanically-coupled fluxonium qubits using strong flux modulation

Weiss¹,

Zhang²,

Ding³

et al. 2022

Preprint

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Long coherence times, large anharmonicity and robust charge-noise insensitivity render fluxonium qubits an interesting alternative to transmons. Recent experiments have demonstrated record coherence times for lowfrequency fluxonia. Here, we propose a galvanic-coupling scheme with flux-tunable XX coupling. To implement a high-fidelity entangling √iSWAP gate, we modulate the strength of this coupling and devise variable-time identity gates to synchronize required single-qubit operations. Both types of gates are implemented using strong ac flux drives, lasting for only a few drive periods. We employ a theoretical framework capable of capturing qubit dynamics beyond the rotating-wave approximation (RWA) as required for such strong drives. We predict an open-system fidelity of F > 0.999 for the √ iSWAP gate under realistic conditions.

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Section: Two-qubit Entangling Gatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast high-fidelity gates for galvanically-coupled fluxonium qubits using strong flux modulation

Weiss¹,

Zhang²,

Ding³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…ity, both theoretical [53][54][55][56][57][58][59][60] and experimental [43,[61][62][63][64]. As we discuss below, the combination of parametric modulation and accelerated adiabatic evolution gives our approach a number of unique potential advantages over other approaches.…”

Section: Fluxonium Qubits Coupled To a Common Auxiliary System A Basi...mentioning

confidence: 99%

Fast and Robust Geometric Two-Qubit Gates for Superconducting Qubits and Beyond

Setiawan¹,

Groszkowski²,

Clerk³

2022

Preprint

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Quantum protocols based on adiabatic evolution are remarkably robust against imperfections of control pulses and system uncertainties. While adiabatic protocols have been successfully implemented for quantum operations such as quantum state transfer and single-qubit gates, their use for geometric two-qubit gates remains a challenge. In this paper, we propose a general scheme to realize robust geometric two-qubit gates in multi-level qubit systems where the interaction between the qubits is mediated by an auxiliary system (such as a bus or coupler). While our scheme utilizes Stimulated Raman Adiabatic Passage (STIRAP), it is substantially simpler than STIRAP-based gates that have been proposed for atomic platforms, requiring fewer control tones and ancillary states, as well as utilizing only a generic dispersive interaction. We also show how our gate can be accelerated using a shortcuts-to-adiabaticity approach, allowing one to achieve a gate that is both fast and relatively robust. We present a comprehensive theoretical analysis of the performance of our two-qubit gate in a parametrically-modulated superconducting circuits comprising two fluxonium qubits coupled to an auxiliary system.

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“…As we will review in Section 4.2, the fabrication of superinductors is not straightforward, representing an open and active field of research, and their complex structure can even introduce some degree of sensitivity to charge noise (via phase slip events). Because of all these aspects, fluxonium qubits have the potential to soon become an alternative and competing platform with respect to transmons [125].…”

Section: Limitations (Small Anharmonicity and Absence Of Protection A...mentioning

confidence: 99%

Novel architectures for noise-resilient superconducting qubits

Calzona¹,

Carrega²

2022

Preprint

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Great interest revolves around the development of new strategies to efficiently store and manipulate quantum information in a robust and decoherence-free fashion. Several proposals have been put forward to encode information into qubits that are simultaneously insensitive to relaxation and to dephasing processes. Among all, given their versatility and high-degree of control, superconducting qubits have been largely investigated in this direction. Here, we present a survey on the basic concepts and ideas behind the implementation of novel superconducting circuits with intrinsic protection against decoherence at a hardware level. In particular, the main focus is on multi-mode superconducting circuits, the paradigmatic example being the so-called 0 − π circuit. We report on their working principle and possible physical implementations based on conventional Josephson elements, presenting recent experimental realizations, discussing both fabrication methods and characterizations.

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Fluxonium: An Alternative Qubit Platform for High-Fidelity Operations

Cited by 65 publications

References 57 publications

Fast high-fidelity gates for galvanically-coupled fluxonium qubits using strong flux modulation

Fast high-fidelity gates for galvanically-coupled fluxonium qubits using strong flux modulation

Fast and Robust Geometric Two-Qubit Gates for Superconducting Qubits and Beyond

Novel architectures for noise-resilient superconducting qubits

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