Programmable quantum channels and measurements

Details Programmable quantum channels and measurements Programmable quantum channels and measurements

2005-10-05

arxiv.org/abs/quant-ph/0510033v1

Physics

Quantum Physics

Presented at Workshop on Quantum Information Theory and Quantum Statistical Inference, 17-18 November 2005, Tokyo, ERATO Quant

Scientific paper

We review some partial results for two strictly related problems. The first problem consists in finding the optimal joint unitary transformation on system and ancilla which is the most efficient in programming any desired channel on the system by changing the state of the ancilla. In this respect we present a solution for dimension two for both system and ancilla. The second problem consists in finding the optimal universal programmable detector, namely a device that can be tuned to perform any desired measurement on a given quantum system, by changing the state of an ancilla. With a finite dimension for the ancilla only approximate universal programmability is possible, with minimal dimension increasing function versus the precision of the approximation. We show that one can achieve a dimension growing polynomially versus the precision, and even linearly in specific cases.

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