Universal quantum interfaces

Seth Lloyd, Andrew J. Landahl, and Jean-Jacques E. Slotine
Phys. Rev. A 69, 012305 – Published 13 January 2004
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Abstract

To observe or control a quantum system, one must interact with it via an interface. This article exhibits simple universal quantum interfaces—quantum input/output ports consisting of a single two-state system or quantum bit that interacts with the system to be observed or controlled. It is shown that under very general conditions the ability to observe and control the quantum bit on its own implies the ability to observe and control the system itself. The interface can also be used as a quantum communication channel, and multiple quantum systems can be connected by interfaces to become an efficient universal quantum computer. Experimental realizations are proposed, and implications for controllability, observability, and quantum information processing are explored.

  • Received 10 March 2003

DOI:https://doi.org/10.1103/PhysRevA.69.012305

©2004 American Physical Society

Authors & Affiliations

Seth Lloyd1,*, Andrew J. Landahl2,3,†, and Jean-Jacques E. Slotine4,‡

  • 1d’Arbeloff Laboratory for Information Systems and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Center for Bits and Atoms, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 3HP Labs, Palo Alto, California 94304-1126, USA
  • 4Nonlinear Systems Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • *Email address: slloyd@mit.edu
  • Email address: alandahl@mit.edu
  • Email address: jjs@mit.edu

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Vol. 69, Iss. 1 — January 2004

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