Quantum random walk of the field in an externally driven cavity Academic Article uri icon


  • Using a resonant interaction between atoms and the field in a high-quality cavity, we show how to realize quantum random walks as proposed by Aharonov [Phys. Rev. A 48, 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 iSx(a-a) 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 wave function depending on the state of the two-level atom. Measurements of the state of the two-level atom would then generate an effective state of the field. Using a homodyne technique, the state of the quantum random walker can be monitored. 2005 The American Physical Society.

published proceedings

  • Physical Review A

author list (cited authors)

  • Agarwal, G. S., & Pathak, P. K.

citation count

  • 19

complete list of authors

  • Agarwal, GS||Pathak, PK

publication date

  • September 2005