Statistical Constraints on State Preparation for a Quantum Computer

Details Statistical Constraints on State Preparation for a Quantum Computer Statistical Constraints on State Preparation for a Quantum Computer

2000-10-30

arxiv.org/abs/quant-ph/0010109v2

Pramana, vol. 57, pp. 683-688, 2001

Physics

Quantum Physics

7 pages; the final published version

Scientific paper

10.1007/s12043-001-0019-7

Quantum computing algorithms require that the quantum register be initially present in a superposition state. To achieve this, we consider the practical problem of creating a coherent superposition state of several qubits. Owing to considerations of quantum statistics, this requires that the entropy of the system go down. This, in turn, has two practical implications: (i) the initial state cannot be controlled; (ii) the temperature of the system must be reduced. These factors, in addition to decoherence and sensitivity to errors, must be considered in the implementation of quantum computers.

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