Phys. Rev. Lett. 83, 4888–4891 (1999)

Universal Control of Decoupled Quantum Systems

Abstract

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Lorenza Viola^1,*, Seth Lloyd^1,†, and Emanuel Knill^2,‡
¹d'Arbeloff Laboratory for Information Systems and Technology, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
²Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Received 14 June 1999; published in the issue dated 6 December 1999

We show that if one can perform a restricted set of fast manipulations on a quantum system, one can implement a large class of dynamical evolutions by effectively removing or introducing selected Hamiltonians. The procedure can be used to achieve universal noise-tolerant control based on purely unitary open-loop transformations of the dynamics. As a result, it is in principle possible to perform noise-protected universal quantum computation using no extra space resources.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.83.4888

DOI:

10.1103/PhysRevLett.83.4888

PACS:

03.67.Lx, 03.65.-w, 89.70.+c

^*Email address: vlorenza@mit.edu

^†Email address: slloyd@mit.edu

^‡Email address: knill@lanl.gov

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Phys. Rev. Lett. 83, 4888–4891 (1999)

Universal Control of Decoupled Quantum Systems