Quantum gate using qubit states separated by terahertz

Journal Article · Mon Mar 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.032322· OSTI ID:21408397

Toyoda, Kenji; Urabe, Shinji ^[1]; Haze, Shinsuke ^[1]; Yamazaki, Rekishu ^[2]

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1. Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531 (Japan)
2. JST-CREST, 4-1-8 Honmachi, Kawaguchi, Saitama 331-0012 (Japan)

A two-qubit quantum gate is realized using electronically excited states in a single ion with an energy separation on the order of a terahertz times the Planck constant as a qubit. Two phase-locked lasers are used to excite a stimulated Raman transition between two metastable states D{sub 3/2} and D{sub 5/2} separated by 1.82 THz in a single trapped {sup 40}Ca{sup +} ion to construct a qubit, which is used as the target bit for the Cirac-Zoller two-qubit controlled NOT gate. Quantum dynamics conditioned on a motional qubit is clearly observed as a fringe reversal in Ramsey interferometry.

• OSTI ID: 21408397
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED PARTICLES
ENERGY LEVELS
EXCITED STATES
INTERFEROMETRY
IONS
LASERS
METASTABLE STATES
TRAPPING