Universal quantum circuit for n-qubit quantum gate: A programmable quantum gate

Details Universal quantum circuit for n-qubit quantum gate: A programmable quantum gate Universal quantum circuit for n-qubit quantum gate: A programmable quantum gate

2006-02-21

arxiv.org/abs/quant-ph/0602174v2

Physics

Quantum Physics

Scientific paper

Quantum computation has attracted much attention, among other things, due to its potentialities to solve classical NP problems in polynomial time. For this reason, there has been a growing interest to build a quantum computer. One of the basic steps is to implement the quantum circuit able to realize a given unitary operation. This task has been solved using decomposition of unitary matrices in simpler ones till reach quantum circuits having only single-qubits and CNOTs gates. Usually the goal is to find the minimal quantum circuit able to solve a given problem. In this paper we go in a different direction. We propose a general quantum circuit able to implement any specific quantum circuit by just setting correctly the parameters. In other words, we propose a programmable quantum circuit. This opens the possibility to construct a real quantum computer where several different quantum operations can be realized in the same hardware. The configuration is proposed and its optical implementation is discussed.

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