dorsal/arxiv
View SchemaContinuous-Variable Quantum Teleportation with a Conventional Laser (Rev. Ver.)
| Authors | Mikio Fujii |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0304148 |
| URL | https://arxiv.org/abs/quant-ph/0304148 |
| DOI | 10.1103/PhysRevA.68.050302 |
| Journal | Phys. Rev. A 68, 050302(R) (2003) |
Abstract
We give a description of balanced homodyne detection (BHD) using a conventional laser as a local oscillator (LO), where the laser field outside the cavity is a mixed state whose phase is completely unknown. Our description is based on the standard interpretation of the quantum theory for measurement, and accords with the experimental result in the squeezed state generation scheme. We apply our description of BHD to continuous-variable quantum teleportation (CVQT) with a conventional laser to analyze the CVQT experiment [A. Furusawa et al., Science 282, 706 (1998)], whose validity has been questioned on the ground of intrinsic phase indeterminacy of the laser field [T. Rudolph and B.C. Sanders, Phys. Rev. Lett. 87, 077903 (2001)]. We show that CVQT with a laser is valid only if the unknown phase of the laser field is shared among sender's LOs, the EPR state, and receiver's LO. The CVQT experiment is considered valid with the aid of an optical path other than the EPR channel and a classical channel, directly linking between a sender and a receiver. We also propose a method to probabilistically generate a strongly phase-correlated quantum state via continuous measurement of independent lasers, which is applicable to realizing CVQT without the additional optical path.
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"abstract": "We give a description of balanced homodyne detection (BHD) using a\nconventional laser as a local oscillator (LO), where the laser field outside\nthe cavity is a mixed state whose phase is completely unknown. Our description\nis based on the standard interpretation of the quantum theory for measurement,\nand accords with the experimental result in the squeezed state generation\nscheme. We apply our description of BHD to continuous-variable quantum\nteleportation (CVQT) with a conventional laser to analyze the CVQT experiment\n[A. Furusawa et al., Science 282, 706 (1998)], whose validity has been\nquestioned on the ground of intrinsic phase indeterminacy of the laser field\n[T. Rudolph and B.C. Sanders, Phys. Rev. Lett. 87, 077903 (2001)]. We show that\nCVQT with a laser is valid only if the unknown phase of the laser field is\nshared among sender\u0027s LOs, the EPR state, and receiver\u0027s LO. The CVQT\nexperiment is considered valid with the aid of an optical path other than the\nEPR channel and a classical channel, directly linking between a sender and a\nreceiver. We also propose a method to probabilistically generate a strongly\nphase-correlated quantum state via continuous measurement of independent\nlasers, which is applicable to realizing CVQT without the additional optical\npath.",
"arxiv_id": "quant-ph/0304148",
"authors": [
"Mikio Fujii"
],
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"doi": "10.1103/PhysRevA.68.050302",
"journal_ref": "Phys. Rev. A 68, 050302(R) (2003)",
"title": "Continuous-Variable Quantum Teleportation with a Conventional Laser (Rev. Ver.)",
"url": "https://arxiv.org/abs/quant-ph/0304148"
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