Coherent dynamics of a flux qubit coupled to a harmonic oscillator

Details Coherent dynamics of a flux qubit coupled to a harmonic oscillator Coherent dynamics of a flux qubit coupled to a harmonic oscillator

2004-07-30

arxiv.org/abs/cond-mat/0407810v1

Nature, vol. 431, p. 159, 2004. Online at http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v431/n7005/abs /na

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1038/nature02831

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.

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