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Quantum Computation Using Optically Coupled Quantum Dot ArraysA solid state model for quantum computation has potential advantages in terms of the ease of fabrication, characterization, and integration. The fundamental requirements for a quantum computer involve the realization of basic processing units (qubits), and a scheme for controlled switching and coupling among the qubits, which enables one to perform controlled operations on qubits. We propose a model for quantum computation based on optically coupled quantum dot arrays, which is computationally similar to the atomic model proposed by Cirac and Zoller. In this model, individual qubits are comprised of two coupled quantum dots, and an array of these basic units is placed in an optical cavity. Switching among the states of the individual units is done by controlled laser pulses via near field interaction using the NSOM technology. Controlled rotations involving two or more qubits are performed via common cavity mode photon. We have calculated critical times, including the spontaneous emission and switching times, and show that they are comparable to the best times projected for other proposed models of quantum computation. We have also shown the feasibility of accessing individual quantum dots using the NSOM technology by calculating the photon density at the tip, and estimating the power necessary to perform the basic controlled operations. We are currently in the process of estimating the decoherence times for this system; however, we have formulated initial arguments which seem to indicate that the decoherence times will be comparable, if not longer, than many other proposed models.
Document ID
20020051645
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Pradhan, Prabhakar
(California Univ. Los Angeles, CA United States)
Anantram, M. P.
(NASA Ames Research Center Moffett Field, CA United States)
Wang, K. L.
(California Univ. Los Angeles, CA United States)
Roychowhury, V. P.
(California Univ. Los Angeles, CA United States)
Saini, Subhash
Date Acquired
August 20, 2013
Publication Date
January 1, 1998
Subject Category
Computer Systems
Meeting Information
Meeting: 1st NASA International Conference on Quantum Computing and Quantum Communications
Location: Palm Springs, CA
Country: United States
Start Date: February 17, 1998
End Date: February 20, 1998
Sponsors: NASA Headquarters
Funding Number(s)
PROJECT: RTOP 519-40-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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