Interaction-free quantum computation

Details Interaction-free quantum computation Interaction-free quantum computation

2004-03-23

arxiv.org/abs/quant-ph/0403159v1

Phys. Rev. A 70, 012318 (2004)

Physics

Quantum Physics

11 pages, 7 figures, LaTex2e

Scientific paper

10.1103/PhysRevA.70.012318

In this paper, we study the quantum computation realized by an interaction-free measurement (IFM). Using Kwiat et al.'s interferometer, we construct a two-qubit quantum gate that changes one particle's trajectory according to whether or not the other particle exists in the interferometer. We propose a method for distinguishing Bell-basis vectors, each of which consists of a pair of an electron and a positron, by this gate. (This is called the Bell-basis measurement.) This method succeeds with probability 1 in the limit of $N \to \infty$, where N is the number of beam splitters in the interferometer. Moreover, we can carry out a controlled-NOT gate operation by the above Bell-basis measurement and the method proposed by Gottesman and Chuang. Therefore, we can prepare a universal set of quantum gates by the IFM. This means that we can execute any quantum algorithm by the IFM.

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