Coherent dynamics of a flux qubit coupled to a harmonic oscillator

I. Chiorescu (), P. Bertet, K. Semba, Y. Nakamura, C. J. P. M. Harmans and J. E. Mooij ()
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I. Chiorescu: Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
P. Bertet: Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
K. Semba: Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
Y. Nakamura: Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
C. J. P. M. Harmans: Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
J. E. Mooij: Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)

Nature, 2004, vol. 431, issue 7005, 159-162

Abstract: Abstract In the emerging field of quantum computation1 and quantum information, superconducting devices are promising candidates for the implementation of solid-state quantum bits (qubits). Single-qubit operations2,3,4,5,6, direct coupling between two qubits7,8,9,10 and the realization of a quantum gate11 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 experiments12,13 and cavity quantum electrodynamics14—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.

Date: 2004
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DOI: 10.1038/nature02831

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