Fast, high-fidelity readout of multiple qubits

12th International Workshop on Low Temperature Electronics

Bronn, N.T.^1 ; Abdo, B.^1 ; Inoue, K.^1 ; Lekuch, S.^1 ; Córcoles, A.D.^1 ; Hertzberg, J.B.^1 ; Takita, M.^1 ; Bishop, L.S.^1 ; Gambetta, J.M.^1 ; Chow, J.M.^1

IBM T.J. Watson Research Center, 1101 Kitchawan Rd, Yorktown Heights

NY

10598, United States^1

关键词: Control electronics;    Fast readout;    High-fidelity;    Quantum Computing;    Quantum electrodynamics;    Quantum system;    Readout signals;    Superconducting qubits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/834/1/012003/pdf
DOI  :  10.1088/1742-6596/834/1/012003

来源: IOP

【 摘 要 】

Quantum computing requires a delicate balance between coupling quantum systems to external instruments for control and readout, while providing enough isolation from sources of decoherence. Circuit quantum electrodynamics has been a successful method for protecting superconducting qubits, while maintaining the ability to perform readout [1, 2]. Here, we discuss improvements to this method that allow for fast, high-fidelity readout. Specifically, the integration of a Purcell filter, which allows us to increase the resonator bandwidth for fast readout, the incorporation of a Josephson parametric converter, which enables us to perform high-fidelity readout by amplifying the readout signal while adding the minimum amount of noise required by quantum mechanics, and custom control electronics, which provide us with the capability of fast decision and control.