Coherent dynamics of a flux qubit coupled to a harmonic oscillator

Abstract

In the emerging field of quantum computation and quantum information, superconducting devices are promising candidates for the implementation of solid-state quantum bits or qubits. Single-qubit operations, direct coupling between two qubits, and the realization of a quantum gate have been reported. However, complex manipulation of entangled states - such as the coupling of a two-level system to a quantum harmonic oscillator, as demonstrated in ion/atom-trap experiments or cavity quantum electrodynamics - has yet to be achieved for superconducting devices. Here we demonstrate entanglement between a superconducting flux qubit (a two-level system) and a superconducting quantum interference device (SQUID). The latter provides the measurement system for detecting the quantum states; it is also an effective inductance that, in parallel with an external shunt capacitance, acts as a harmonic oscillator. We achieve generation and control of the entangled state by performing microwave spectroscopy and detecting the resultant Rabi oscillations of the coupled system.

Nature. Received 25 May; accepted 5 July 2004. doi:10.1038/nature02831

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• Dissipative Rabi model for deep strong far-off-resonant driving
• Characterization and generation of a SQL-beating catlike state through repetitive measurements
• The Rayleigh-Lorentz Invariant and Optimal Adiabatic Qubit-Information Detection for Superconducting Qubit Resonators
• Special-Purpose Quantum Processor Design
• Enhanced Tantalum Superconducting Resonator Performance via All-Surface Organic Monolayer Passivation
• Exploring the Fidelity of Flux Qubit Measurement in Different Bases via the Quantum Flux Parametron
• Neutral atom entangling gate in the ultrastrong coupling regime
• Unitary decoupling treatment of a quadratic bimodal CQED model
• Circuit QED: Implementation of the three-qubit refined Deutsch-Jozsa quantum algorithm
• Quantum Jump Approach to Switching Process of a Josephson Junction Coupled to a Microscopic Two-Level System
• Heisenberg-Langevin Formalism For Open Circuit-QED Systems