Work

Decoherence of Flux Qubits due to 1/f Flux Noise

Year: 2006

Type: article

Abstract: We have investigated decoherence in Josephson-junction flux qubits. Based on the measurements of decoherence at various bias conditions, we discriminate contributions of different noise sources. We present a Gaussian decay function extracted from the echo signal as evidence of dephasing due to 1/f flux noise whose spectral density is evaluated to be about (10(-6)Phi0)2/Hz at 1 Hz. We also demonstrate that, at an optimal bias condition where the noise sources are well decoupled, the coherence observed in the echo measurement is limited mainly by energy relaxation of the qubit.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.97.167001

Authors: F. Yoshihara, K. Harrabi, A. O. Niskanen, Y. Nakamura, J. S. Tsai

Institutions: RIKEN, Japan Science and Technology Agency, VTT Technical Research Centre of Finland, NEC (Japan)

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2000386694

FWCI: 11.64

Cites: 17

Cited by: 402

Related to: 10