NOISE IN SWAPPING BETWEEN TWO PAIRS OF NON-ORTHOGONAL ENTANGLED COHERENT STATES

作者：Kumar Shivani A^*; Prakash H; Chandra N; Prakash R

来源：Modern Physics Letters B, 2013, 27(3): 1350017.

DOI：10.1142/S0217984913500176

• Entanglement swapping
• coherent states
• entangled states
• decoherence

We consider a scheme of swapping between two pairs of non-orthogonal entangled coherent states with our suggested modification [H. Prakash, N. Chandra, R. Prakash and Shivani, Int. J. Mod. Phys. B 23(8) (2009) 2083] and discuss effect of decoherence on fidelity in swapping. We find that for odd photon counts, MAF (minimum of the fidelity for any arbitrary information) decreases with increase in vertical bar alpha vertical bar(2) for low noise but in case of high noise, it increases, attains a maximum value and then decreases with vertical bar alpha vertical bar(2). However, for nonzero even photon counts, the case is reversed. For this case, MAF decreases with increase in vertical bar alpha vertical bar(2) for high noise but in case of low noise, it increases, attains a maximum value and then decreases with vertical bar alpha vertical bar(2). We discuss the variation of average fidelity with vertical bar alpha vertical bar(2) and show that it depends appreciably on the information for low values of vertical bar alpha vertical bar(2) only.

• 出版日期2013-1-30