Classicality of quantum information processing

Details Classicality of quantum information processing Classicality of quantum information processing

2001-08-22

arxiv.org/abs/quant-ph/0108102v2

Physics

Quantum Physics

Minor changes, published in Phys. Rev. A 65, 42319 (2002)

Scientific paper

10.1103/PhysRevA.65.042319

The ultimate goal of the classicality programme is to quantify the amount of quantumness of certain processes. Here, classicality is studied for a restricted type of process: quantum information processing (QIP). Under special conditions, one can force some qubits of a quantum computer into a classical state without affecting the outcome of the computation. The minimal set of conditions is described and its structure is studied. Some implications of this formalism are the increase of noise robustness, a proof of the quantumness of mixed state quantum computing and a step forward in understanding the very foundation of QIP.

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