Experiments with a nonlocal single photon

The two-mode quantum state |0,1> - |1,0> of a single photon entangled with vacuum is generated when a single photon is incident upon a symmetric beam splitter. We present a series of experiments demonstrating nonlocal properties of this state and its potential for quantum technology applications, such as quantum teleportation and remote quantum state preparation. The initial single-photon pulses are generated by means of conditional measurements on biphotons produced in spontaneous parametric down-conversion and homodyne tomography is used for quantum state characterization.