Quantum Nondemolition Monitoring of Universal Quantum Computers

Details Quantum Nondemolition Monitoring of Universal Quantum Computers Quantum Nondemolition Monitoring of Universal Quantum Computers

1997-04-15

arxiv.org/abs/quant-ph/9704028v2

Phys.Rev.Lett.80:631,1998

Physics

Quantum Physics

5 pages, RevTeX, no figures, revised, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.80.631

The halt scheme for quantum Turing machines, originally proposed by Deutsch, is reformulated precisely and is proved to work without spoiling the computation. The ``conflict'' pointed out recently by Myers in the definition of a universal quantum computer is shown to be only apparent. In the context of quantum nondemolition (QND) measurement, it is also shown that the output observable, an observable representing the output of the computation, is a QND observable and that the halt scheme is equivalent to the QND monitoring of the output observable.

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