Nondestructive Readout for a Superconducting Flux Qubit

2003/11/30 by Adrian Lupaşcu, A. Lupascu, C.J.M. Verwijs +4 · 10 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevlett.93.177006

published as Phys. Rev. Lett. 93, 177006 (2004) · 4 pages, 4 figures; modified content, figures and references; accepted for publication in Phys. Rev. Lett

openalex publication_date 2004/10/21 · arxiv created 2004/10/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present a new readout method for a superconducting flux qubit, based on the measurement of the Josephson inductance of a superconducting quantum interference device that is inductively coupled to the qubit. The intrinsic flux detection efficiency and backaction are suitable for a fast and nondestructive determination of the quantum state of the qubit, as needed for readout of multiple qubits in a quantum computer. We performed spectroscopy of a flux qubit and we measured relaxation times of the order of 80 micros.

Cited by

• Quantum downconversion and multipartite entanglement via a mesoscopic superconducting quantum interference device ring
• Phase-space theory for dispersive detectors of superconducting qubits
• Quantum nondemolition-like fast measurement scheme for a superconducting qubit
• High-Contrast Dispersive Readout of a Superconducting Flux Qubit Using a Nonlinear Resonator
• Quantum state detection of a superconducting flux qubit using a dc-SQUID in the inductive mode
• Phase coherent dynamics of a superconducting flux qubit with capacitive bias readout
• Silent phase qubit based ond-wave Josephson junctions
• Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits
• Readout for phase qubits without Josephson junctions
• RF-Driven Josephson Bifurcation Amplifier for Quantum Measurement
• Quantum phase dynamics in an LC shunted Josephson junction

Related

• Single-Shot Readout of Macroscopic Quantum Superposition State in a Superconducting Flux Qubit
• Efficient readout of flux qubits at degeneracy
• Decoherence of the flux-based superconducting qubit in an integrated circuit environment
• Possible implementation of adiabatic quantum algorithm with superconducting flux qubits
• Simulation of a rapid qubit readout dependent on the transmission of a single fluxon