dorsal/arxiv
View SchemaBroadband teleportation
| Authors | P. van Loock, Samuel L. Braunstein, H. J. Kimble |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9902030 |
| URL | https://arxiv.org/abs/quant-ph/9902030 |
| DOI | 10.1103/PhysRevA.62.022309 |
| Journal | Phys. Rev. A 62, 022309 (2000) |
Abstract
Quantum teleportation of an unknown broadband electromagnetic field is investigated. The continuous-variable teleportation protocol by Braunstein and Kimble [Phys. Rev. Lett. {\bf 80}, 869 (1998)] for teleporting the quantum state of a single mode of the electromagnetic field is generalized for the case of a multimode field with finite bandwith. We discuss criteria for continuous-variable teleportation with various sets of input states and apply them to the teleportation of broadband fields. We first consider as a set of input fields (from which an independent state preparer draws the inputs to be teleported) arbitrary pure Gaussian states with unknown coherent amplitude (squeezed or coherent states). This set of input states, further restricted to an alphabet of coherent states, was used in the experiment by Furusawa {\it et al.} [Science {\bf 282}, 706 (1998)]. It requires unit-gain teleportation for optimizing the teleportation fidelity. In our broadband scheme, the excess noise added through unit-gain teleportation due to the finite degree of the squeezed-state entanglement is just twice the (entanglement) source's squeezing spectrum for its ``quiet quadrature.'' The teleportation of one half of an entangled state (two-mode squeezed vacuum state), i.e., ``entanglement swapping,'' and its verification are optimized under a certain nonunit gain condition. We will also give a broadband description of this continuous-variable entanglement swapping based on the single-mode scheme by van Loock and Braunstein [Phys. Rev. A {\bf 61}, 10302 (2000)]
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"abstract": "Quantum teleportation of an unknown broadband electromagnetic field is\ninvestigated. The continuous-variable teleportation protocol by Braunstein and\nKimble [Phys. Rev. Lett. {\\bf 80}, 869 (1998)] for teleporting the quantum\nstate of a single mode of the electromagnetic field is generalized for the case\nof a multimode field with finite bandwith. We discuss criteria for\ncontinuous-variable teleportation with various sets of input states and apply\nthem to the teleportation of broadband fields. We first consider as a set of\ninput fields (from which an independent state preparer draws the inputs to be\nteleported) arbitrary pure Gaussian states with unknown coherent amplitude\n(squeezed or coherent states). This set of input states, further restricted to\nan alphabet of coherent states, was used in the experiment by Furusawa {\\it et\nal.} [Science {\\bf 282}, 706 (1998)]. It requires unit-gain teleportation for\noptimizing the teleportation fidelity. In our broadband scheme, the excess\nnoise added through unit-gain teleportation due to the finite degree of the\nsqueezed-state entanglement is just twice the (entanglement) source\u0027s squeezing\nspectrum for its ``quiet quadrature.\u0027\u0027 The teleportation of one half of an\nentangled state (two-mode squeezed vacuum state), i.e., ``entanglement\nswapping,\u0027\u0027 and its verification are optimized under a certain nonunit gain\ncondition. We will also give a broadband description of this\ncontinuous-variable entanglement swapping based on the single-mode scheme by\nvan Loock and Braunstein [Phys. Rev. A {\\bf 61}, 10302 (2000)]",
"arxiv_id": "quant-ph/9902030",
"authors": [
"P. van Loock",
"Samuel L. Braunstein",
"H. J. Kimble"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.62.022309",
"journal_ref": "Phys. Rev. A 62, 022309 (2000)",
"title": "Broadband teleportation",
"url": "https://arxiv.org/abs/quant-ph/9902030"
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