Homodyne tomography characterization and nonlocality of a dual-mode optical qubit.
Physical review letters 92:19 (2004) 193601
Abstract:
A single photon, delocalized over two optical modes, is characterized by means of quantum homodyne tomography. The reconstructed four-dimensional density matrix extends over the entire Hilbert space and thus reveals, for the first time, complete information about the dual-rail optical quantum bit as a state of the electromagnetic field. The experimental data violate the Bell inequality albeit with a loophole similar to the detection loophole in photon counting experiments.Remote Preparation of a Single-Mode Photonic Qubit by Measuring Field Quadrature Noise
Physical Review Letters 92:4 (2004) 479031-479034
Abstract:
Remote state preparation of single-mode photonic quantum bits in a counter intuitive scheme was discussed. An electromagnetic field quadrature measurement was performed. The measurements collapses the nonlocal single-photon state into a superposition of the single-photon and vacuum states in the other mode. It was found that the preparation efficiency of the resulting qubit can be higher than that of the initial single photon.Remote preparation of a single-mode photonic qubit by measuring field quadrature noise.
Physical review letters 92:4 (2004) 047903
Abstract:
An electromagnetic field quadrature measurement, performed on one of the modes of the nonlocal single-photon state alpha|1,0>-beta|0,1>, collapses it into a superposition of the single-photon and vacuum states in the other mode. We use this effect to implement remote preparation of arbitrary single-mode photonic qubits conditioned on observation of a preselected quadrature value. The preparation efficiency of the resulting qubit can be higher than that of the initial single photon.10 Maximum-Likelihood Estimationin Experimental Quantum Physics
Chapter in Quantum State Estimation, Springer Nature 649 (2004) 373-414
Homodyne tomography characterization and nonlocality of a dual-mode optical qubit
(2003)