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.
Keywords
Cite
@article{arxiv.cond-mat/0407810,
title = {Coherent dynamics of a flux qubit coupled to a harmonic oscillator},
author = {I. Chiorescu and P. Bertet and K. Semba and Y. Nakamura and C. J. P. M. Harmans and J. E. Mooij},
journal= {arXiv preprint arXiv:cond-mat/0407810},
year = {2009}
}
Comments
Nature. Received 25 May; accepted 5 July 2004. doi:10.1038/nature02831