dorsal/arxiv
View SchemaImproving teleportation of continuous variables by local operations
| Authors | Ladislav Mišta Jr, Radim Filip |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0410185 |
| URL | https://arxiv.org/abs/quant-ph/0410185 |
| DOI | 10.1103/PhysRevA.71.032342 |
Abstract
We study a continuous-variable (CV) teleportation protocol based on a shared entangled state produced by the quantum-nondemolition (QND) interaction of two vacuum states. The scheme utilizes the QND interaction or an unbalanced beam splitter in the Bell measurement. It is shown that in the non-unity gain regime the signal transfer coefficient can be enhanced while the conditional variance product remains preserved by applying appropriate local squeezing operation on sender's part of the shared entangled state. In the unity gain regime it is demonstrated that the fidelity of teleportation can be increased with the help of the local squeezing operations on parts of the shared entangled state that convert effectively our scheme to the standard CV teleportation scheme. Further, it is proved analytically that such a choice of the local symplectic operations minimizes the noise by which the mean number of photons in the input state is increased during the teleportation. Finally, our analysis reveals that the local symplectic operation on sender's side can be integrated into the Bell measurement if the interaction constant of the interaction in the Bell measurement can be adjusted properly.
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"abstract": "We study a continuous-variable (CV) teleportation protocol based on a shared\nentangled state produced by the quantum-nondemolition (QND) interaction of two\nvacuum states. The scheme utilizes the QND interaction or an unbalanced beam\nsplitter in the Bell measurement. It is shown that in the non-unity gain regime\nthe signal transfer coefficient can be enhanced while the conditional variance\nproduct remains preserved by applying appropriate local squeezing operation on\nsender\u0027s part of the shared entangled state. In the unity gain regime it is\ndemonstrated that the fidelity of teleportation can be increased with the help\nof the local squeezing operations on parts of the shared entangled state that\nconvert effectively our scheme to the standard CV teleportation scheme.\nFurther, it is proved analytically that such a choice of the local symplectic\noperations minimizes the noise by which the mean number of photons in the input\nstate is increased during the teleportation. Finally, our analysis reveals that\nthe local symplectic operation on sender\u0027s side can be integrated into the Bell\nmeasurement if the interaction constant of the interaction in the Bell\nmeasurement can be adjusted properly.",
"arxiv_id": "quant-ph/0410185",
"authors": [
"Ladislav Mi\u0161ta Jr",
"Radim Filip"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.71.032342",
"title": "Improving teleportation of continuous variables by local operations",
"url": "https://arxiv.org/abs/quant-ph/0410185"
},
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