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Suppression of energy-relaxation-induced decoherence in Λ-type three-level SQUID flux qubits: A dark-state approach
Zhou, Zhongyuan Chu, Shih-I Han, Siyuan
Zhou, Zhongyuan
Chu, Shih-I
Han, Siyuan
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Abstract
We report a theoretical investigation of decoherence induced by energy relaxation of the auxiliary level in the Λ-type three-level SQUID flux qubits. We show that the energy-relaxation-induced decoherence in this particular case is proportional to the average population of the auxiliary level and thus can be effectively suppressed by the use of a dark-state approach in which the auxiliary level is unpopulated. We demonstrate through bit-flip operation that the dark state can be realized by means of the stimulated Raman adiabatic passage (STIRAP). An extension of the dark-state scheme to create any superposition state is straightforward.
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This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevB.70.094513.
Date
2004-09-23
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American Physical Society
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Zhou, Zhongyuan., Chu, Shih-I., Han, Siyuan. "Suppression of energy-relaxation-induced decoherence in Λ-type three-level SQUID flux qubits: A dark-state approach." Phys. Rev. B 70, 094513 – Published 23 September 2004. http://dx.doi.org/10.1103/PhysRevB.70.094513.