Tuning the coupling between superconducting resonators with collective qubits

Qi-Ming Chen, Yu-xi Liu, Luyan Sun, and Re-Bing Wu
Phys. Rev. A 98, 042328 – Published 19 October 2018

Abstract

By coupling a collection of two-level artificial atoms simultaneously to two superconducting resonators, we propose a quantum switch that can tune the resonator-resonator coupling strength from zero to a large value proportional to the qubit number. This process is realized by preparing the qubits in different pairwise subradiant states, where the microwave photons released by different qubits interfere destructively such that the coupling strength can be stabilized in an open environment. The resulting two-step control scheme tunes the coupling strength between different values in nanoseconds without changing the transition frequency of the qubits. We also use the quantum switch to network multiple resonators with programmable couplings, and we demonstrate its potential applications in quantum simulation and quantum information storage and processing.

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  • Received 12 April 2018

DOI:https://doi.org/10.1103/PhysRevA.98.042328

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Qi-Ming Chen1, Yu-xi Liu2,3, Luyan Sun4, and Re-Bing Wu1,3,*

  • 1Department of Automation, Tsinghua University, Beijing 100084, China
  • 2Institute of Microelectronics, Tsinghua University, Beijing 100084, China
  • 3Center for Quantum Information Science and Technology, BNRist, Beijing 100084, China
  • 4Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China

  • *rbwu@tsinghua.edu.cn

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Issue

Vol. 98, Iss. 4 — October 2018

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