"[0F435734DE17]" . "Mi\u0161ta, Ladislav" . "3" . "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 nonunity 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 effectively convert 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 th" . "524431" . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "71" . "P(GP202/03/D239), Z(MSM6198959213)" . . . "teleportation; continous variables"@en . "Zlep\u0161ov\u00E1n\u00ED teleportace spojit\u00FDch prom\u011Bnn\u00FDch lok\u00E1ln\u00EDmi operacemi"@cs . . "RIV/61989592:15310/05:00001852" . "Improving teleportation of continuous variables by local operations" . "Physical Review A" . . "153"^^ . "032342-1-9" . . "1050-2947" . "2"^^ . . . "Improving teleportation of continuous variables by local operations"@en . . . . "Filip, Radim" . "Improving teleportation of continuous variables by local operations"@en . . . "2"^^ . . "RIV/61989592:15310/05:00001852!RIV06-MSM-15310___" . . . "Zlep\u0161ov\u00E1n\u00ED teleportace spojit\u00FDch prom\u011Bnn\u00FDch lok\u00E1ln\u00EDmi operacemi"@cs . . "Studujeme teleporta\u010Dn\u00ED protokol pro spojit\u00E9 prom\u011Bnn\u00E9, zalo\u017Een\u00FD na sd\u00EDlen\u00E9m prov\u00E1zan\u00E9m stavu vytvo\u0159en\u00E9m kvantov\u011B-nedemoli\u010Dn\u00ED interakci dvou vakuov\u00FDch stav\u016F. Toto sch\u00E9ma vyu\u017E\u00EDv\u00E1 kvantov\u011B-nedemoli\u010Dn\u00ED interakci nebo nevyv\u00E1\u017Een\u00FD d\u011Bli\u010D v Bellov\u011B m\u011B\u0159en\u00ED. Je uk\u00E1z\u00E1no, \u017Ee v re\u017Eimu s nejednotkov\u00FDm ziskem lze nav\u00FD\u0161it koeficient p\u0159enosu sign\u00E1lu, zat\u00EDmco sou\u010Din podm\u00EDn\u011Bn\u00FDch varianc\u00ED z\u016Fst\u00E1v\u00E1 zachov\u00E1n aplikac\u00ED vhodn\u00E9 lok\u00E1ln\u00ED stla\u010Dovac\u00ED operace na odes\u00EDlatelov\u011B \u010D\u00E1sti sd\u00EDlen\u00E9ho prov\u00E1zan\u00E9ho stavu. V re\u017Eimu s jednotkov\u00FDm ziskem je demonstrov\u00E1no, \u017Ee fidelitu teleportace lze zv\u00FD\u0161it s pomoc\u00ED lok\u00E1ln\u00EDch stla\u010Dovac\u00EDch operac\u00ED na \u010D\u00E1stech sd\u00EDlen\u00E9ho prov\u00E1zan\u00E9ho stavu, kter\u00E9 efektivn\u011B p\u0159ev\u00E1d\u011Bj\u00ED na\u0161e sch\u00E9ma na standardn\u00ED teleporta\u010Dn\u00ED sch\u00E9ma. D\u00E1le ukazujeme analyticky, \u017Ee takov\u00E1 volba lok\u00E1ln\u00EDch symplektick\u00FDch operac\u00ED minimalizuje \u0161um, o kter\u00FD je b\u011Bhem teleportace zv\u011Bt\u0161en st\u0159edn\u00ED po\u010Det foton\u016F ve vstupn\u00EDm stavu. Nakonec na\u0161e anal\u00FDza odhaluje, \u017Ee lok\u00E1ln\u00ED symplektickou operaci na stran\u011B odes\u00EDlatele lze integrovat do Bellova m\u011B\u0159en\u00ED, pokud m"@cs . "15310" . "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 nonunity 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 effectively convert 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 th"@en . "Improving teleportation of continuous variables by local operations" .