Charge-Related SQUID and Tunable Phase-Slip Flux Qubit
ZHAO Hu, LI Tie-Fu, LIU Jian-She, CHEN Wei**
Institute of Microelectronics, Tsinghua National Laboratory of Information Science and Technology, Tsinghua University, Beijing 100084
Abstract ：A phase-slip flux qubit, exactly dual to a charge qubit, is composed of a superconducting loop interrupted by a phase-slip junction. We propose a tunable phase-slip flux qubit by replacing the phase-slip junction with a charge-related superconducting quantum interference device (SQUID) consisting of two phase-slip junctions connected in series with a superconducting island. This charge-SQUID acts as an effective phase-slip junction controlled by the applied gate voltage and can be used to tune the energy-level splitting of the qubit. In addition, we show that a large inductance inserted in the loop can reduce the inductance energy and consequently suppress the dominating flux noise of the phase-slip flux qubit. This enhanced phase-slip flux qubit is exactly dual to a transmon qubit.
收稿日期: 2013-11-15
出版日期: 2014-02-28
:
03.67.Lx
(Quantum computation architectures and implementations)
85.25.Dq
(Superconducting quantum interference devices (SQUIDs))
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2014, Vol. 31 
