DESCRIBING QUANTUM TELEPORTATION OF MIXED STATES WITH CONTINUUM VARIABLES BY THE ENTANGLED STATE REPRESENTATION

By virtue of the entangled state representation, we show that the quantum teleportated state in Bob, after Alice makes an Einstein-Podolsky-Rosen measurement and Bob makes an appropriate unitary transformation on hearing Alice's measurement result via a classical channel, is described by (rho) over bar (out) = integral d(2)eta/pi F(eta)D-2(-eta*)rho D-in(2)dagger(-eta*), where F(eta) equivalent to 23 <eta vertical bar rho 23 vertical bar eta > 23, rho 23 stands for a quantum channel in 2-3 modes, vertical bar eta > 23 is the bipartite entangled state, and D-2(eta) = exp{eta a(2)(dagger)-eta*a(2)} is a displacement transform performed by Bob.