Tunable Coupling in Circuit Quantum Electrodynamics Using a Superconducting Charge Qubit with aV-Shaped Energy Level Diagram

2010/11/18 by Srikanth Srinivasan, S. J. Srinivasan, A. J. Hoffman +5
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevlett.106.083601

published as Phys. Rev. Lett. 106, 083601 (2011) · 5 pages, 4 figures

arxiv created 2010/11/18 · openalex publication_date 2011/02/22 · arxiv updated 2011/06/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We introduce a new type of superconducting charge qubit that has a V-shaped energy spectrum and uses quantum interference to provide independently tunable qubit energy and coherent coupling to a superconducting cavity. Dynamic access to the strong coupling regime is demonstrated by tuning the coupling strength from less than 200 kHz to greater than 40 MHz. This tunable coupling can be used to protect the qubit from cavity-induced relaxation and avoid unwanted qubit-qubit interactions in a multiqubit system.

Citations

• Superconducting Qubit with Purcell Protection and Tunable Coupling
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
• Coupling superconducting qubits via a cavity bus

Cited by

• A high-fidelity two-qubit gate for multimode superconducting P-mon qubits