Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast Readout

2004/05/31 by Ken B. Cooper, K. B. Cooper, Matthias Steffen +6 · 5 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

paper · pdf · doi:10.1103/physrevlett.93.180401

arxiv created 2004/05/31 · openalex publication_date 2004/10/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain. The junction-fluctuator interaction also points to a possible mechanism for decoherence and reduced fidelity in superconducting qubits.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Demonstration of conditional gate operation using superconducting charge qubits
• The Physical Implementation of Quantum Computation

Cited by

• Low-loss superconducting resonant circuits using vacuum-gap-based microwave components
• High-Contrast Dispersive Readout of a Superconducting Flux Qubit Using a Nonlinear Resonator
• Superconducting qubits coupled to nanoelectromechanical resonators: An architecture for solid-state quantum-information processing
• Phase coherent dynamics of a superconducting flux qubit with capacitive bias readout
• Remote sensing and control of phase qubits