Demonstration of a quantum logic gate in a cryogenic surface-electrode ion trap

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062332· OSTI ID:21407925

Wang, Shannon X; Labaziewicz, Jaroslaw; Ge, Yufei; Shewmon, Ruth; Chuang, Isaac L ^[1]

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1. Center for Ultracold Atoms, Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 (United States)

We demonstrate quantum control techniques for a single trapped ion in a cryogenic, surface-electrode trap. A narrow optical transition of Sr{sup +} along with the ground and first excited motional states of the harmonic trapping potential form a two-qubit system. The optical qubit transition is susceptible to magnetic field fluctuations, which we stabilize with a simple and compact method using superconducting rings. Decoherence of the motional qubit is suppressed by the cryogenic environment. ac Stark shift correction is accomplished by controlling the laser phase in the pulse sequencer, eliminating the need for an additional laser. Quantum process tomography is implemented on atomic and motional states by use of conditional pulse sequences. With these techniques, we demonstrate a Cirac-Zoller controlled-not gate in a single ion with a mean fidelity of 91(1)%.

• OSTI ID: 21407925
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED PARTICLES
CONTROL
DIAGNOSTIC TECHNIQUES
ELECTRODES
FLUCTUATIONS
IONS
LASERS
MAGNETIC FIELDS
POTENTIALS
PULSES
SURFACES
TOMOGRAPHY
TRAPPING
TRAPS
VARIATIONS