Coherent dynamics of a flux qubit coupled to a harmonic oscillator
| Autor: | Patrice Bertet, C. J. P. M. Harmans, J. E. Mooij, Yasunobu Nakamura, Kouichi Semba, Irinel Chiorescu |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Flux qubit Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity FOS: Physical sciences Quantum Physics Phase qubit Quantum technology Superconductivity (cond-mat.supr-con) Quantum error correction Quantum mechanics Qubit Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Quantum information Superconducting quantum computing Trapped ion quantum computer |
| Zdroj: | Nature. 431(7005) |
| ISSN: | 1476-4687 |
| Popis: | 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. Comment: Nature. Received 25 May; accepted 5 July 2004. doi:10.1038/nature02831 |
| Databáze: | OpenAIRE |
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