6 July 1998 Vibrational decoherence in ion-trap quantum computers
Author Affiliations +
Proceedings Volume 3385, Photonic Quantum Computing II; (1998); doi: 10.1117/12.312644
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States
Abstract
Decoherence is studied in an attractive proposal for an actual implementation of a quantum computer based on trapped ions.Emphasis is placed on the decoherence arising from the vibrational motion of the ions, which is compared with that due to spontaneous emission from excited states of the ions. The calculations is made tractable by exploiting the vast difference in time scales between the vibrational excitations and the intra-ionic electronic excitations. Since the latter are several orders of magnitude faster, an adiabatic approximation is used to integrate them out and find the inclusive probability for the electronic state of the ions to evolve as it would in the absence of vibrational coupling, and the ions to evolve into any state whatsoever. The decoherence time is found at zero temperature and for any number of ions N in the computer. Comparison is made with the spontaneous emission decoherence, and the implications for how trap voltages and other parameters should be scaled with N are discussed.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anupam Garg, "Vibrational decoherence in ion-trap quantum computers", Proc. SPIE 3385, Photonic Quantum Computing II, (6 July 1998); doi: 10.1117/12.312644; https://doi.org/10.1117/12.312644
PROCEEDINGS
12 PAGES


SHARE
KEYWORDS
Ions

Computing systems

Quantum computing

Superposition

Quantum communications

Quantum mechanics

Quantum physics

RELATED CONTENT

Quantum models of Parrondo's games
Proceedings of SPIE (November 13 2002)
Qubit decoherence
Proceedings of SPIE (July 01 1997)
Quantum decoherence and qubit devices
Proceedings of SPIE (May 08 2003)
Quantum computation and hidden variables
Proceedings of SPIE (April 29 2008)
Is quantum parallelism real?
Proceedings of SPIE (April 03 2008)

Back to Top