Coherent dynamics of a flux qubit coupled to a harmonic oscillator

In the emerging field of quantum computation and quantum information, superconducting devices are promising candidates for the implementation of solid-state quantum bits (qubits). Single-qubit operations, direct coupling between two qubits and the realization of a quantum gate have been reported. Ho...

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Bibliographic Details
Published in:Nature 2004-09, Vol.431 (7005), p.159-162
Main Authors: Chiorescu, I, Mooij, J. E, Bertet, P, Semba, K, Nakamura, Y, Harmans, C. J. P. M
Format: Article
Language:English
Subjects:
Atoms & subatomic particles
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Humanities and Social Sciences
letter
multidisciplinary
Physics
Quantum computation
Quantum information
Quantum theory
Science
Science (multidisciplinary)
Spectrum analysis
Superconductors
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Summary:In the emerging field of quantum computation and quantum information, superconducting devices are promising candidates for the implementation of solid-state quantum bits (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 and 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.
ISSN:0028-0836
1476-4687
DOI:10.1038/nature02831