Quantum teleportation with close-to-maximal entanglement from a beam splitter
Ngoc-Khanh Tran, Olivier Pfister · Physical Review A · 2002
We investigate theoretically quantum teleportation by means of the number-sum and phase-difference variables. We show that a unitary beam-splitter transformation turns two-mode Fock-states into close-to-maximally entangled states, in this case close approximations of the relative-phase eigenstates. These states could be created experimentally using on-demand single-photon sources, but also with any second-quantized bosonic system (e.g., trapped ions, Bose-Einstein condensates). We show that such ``quasi-EPR'' states can yield near-unity fidelity for the teleportation of coherent states and of ``Schr\"odinger cat'' states.