Charge-Related SQUID and Tunable Phase-Slip Flux Qubit

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2014,（3）
• 页码范围: 14-17
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/31/3/030303

摘要

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.