Phase estimation as a quantum nondemolition measurement

Details Phase estimation as a quantum nondemolition measurement Phase estimation as a quantum nondemolition measurement

2002-03-27

arxiv.org/abs/quant-ph/0203130v1

Physics

Quantum Physics

4 pages, 2 figures, RevTeX 4

Scientific paper

The phase estimation algorithm, which is at the heart of a variety of quantum algorithms, including Shor's factoring algorithm, allows a quantum computer to accurately determine an eigenvalue of an unitary operator. Quantum nondemolition measurements are a quantum mechanical procedure, used to overcome the standard quantum limit when measuring an observable. We show that the phase estimation algorithm, in both the discrete and continuous variable setting, can be viewed as a quantum nondemolition measurement.

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