Entangled coherent states: Teleportation and decoherence
01 August 2001
When a superposition (textbackslash{}alpha]-textbackslash{}-alpha]) of two coherent states with opposite phase falls upon a 50-50 beam splitter, the resulting state is entangled.
Remarkably, the amount of entanglement is exactly 1 ebit, irrespective of alpha, as was recently discovered by Hirota and Sasaki {[}LANL e-print quant-ph/0101018]. Here we discuss decoherence properties of such states and give a simple protocol that teleports one qubit encoded in Schrodinger cat states.