Quantum random walk of the field in an externally driven cavity

Details Quantum random walk of the field in an externally driven cavity Quantum random walk of the field in an externally driven cavity

2005-04-18

arxiv.org/abs/quant-ph/0504135v1

Phys. Rev. A 72, 033815 (2005).

Physics

Quantum Physics

6-page 4-fig. submitted Phy. Rev A

Scientific paper

10.1103/PhysRevA.72.033815

Using resonant interaction between atoms and the field in a high quality cavity, we show how to realize quantum random walks as proposed by Aharonov et al [Phys. Rev. A {\bf48}, 1687 (1993)]. The atoms are driven strongly by a classical field. Under conditions of strong driving we could realize an effective interaction of the form $ iS^{x}(a-a^{\dag})$ in terms of the spin operator associated with the two level atom and the field operators. This effective interaction generates displacement in the field's wavefunction depending on the state of the two level atom. Measurements of the state of the two level atom would then generate effective state of the field. Using a homodyne technique, the state of the quantum random walker can be monitored.

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