Observation of long decoherence times in a quantum logic gate using trapped Ba137 ions

Author

DeVoe, R. ; Kurtsiefer, C.

Author_Institution

IBM Almaden Res. Center, San Jose, CA, USA

fYear

2001

fDate

11-11 May 2001

Firstpage

240

Lastpage

241

Abstract

Summary form only given. Trapped ion quantum logic gates following the model of Cirac and Zoller have been constructed by the NIST and Innsbrueck groups using /sup 9/Be/sup +/ and /sup 40/Ca/sup +/ ions respectively. We are operating a new quantum logic gate using the /sup 137/Ba/sup +/ ion confined in a microscopic trap of 80 microns radius. Raman cooling to the ground state, with N < 1, is shown by the asymmetric sidebands shown. We have measured the decoherence time of a such a cooled phonon mode to be greater than 1 millisecond, which indicates that the anomalously fast decays seen by the NIST group is not dominant here.

Keywords

Raman spectra; barium; laser cooling; optical logic; phonons; quantum computing; quantum optics; radiation pressure; /sup 137/Ba/sup +/; /sup 137/Ba/sup +/ ion; /sup 40/Ca/sup +/; /sup 40/Ca/sup +/ ions; /sup 9/Be/sup +/; /sup 9/Be/sup +/ ions; 1 ms; 160 micron; Raman cooling; asymmetric sidebands; cooled phonon mode; decoherence time; ground state; long decoherence times; microscopic trap; quantum logic gate; trapped Ba137 ions; trapped ion quantum logic gates; Cryptography; Error analysis; Laboratories; Logic gates; NIST; Phonons; Probes; Protocols; Quantum computing; Stationary state;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-663-X

Type

conf

DOI

10.1109/QELS.2001.962184

Filename

962184