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Quantum Electronics and Laser Science Conference

Quantum switch teleportation with continuous variables using two-mode squeezed light

Yun Zhang, K. Kasai, Masayoshi Watanabe

Published Jun 25, 2003• 0 citations
Publisher

Abstract

Summary form only given. The scheme for continuous variable switch teleportation was proposed by using a pair of two-mode squeezed state lights on beamsplitter of 50% and polarizing beam splitter. Teleportation ability is examined by the criteria proposed by Ralph and Lam (1998) from a small signal quantum optical point of view. A pair of two-mode squeezed lights, which are coupled by two modes with identical frequency but orthogonal polarization, are mixed on a 50:50 beamsplitter. The outgoing fields are separated into A,B,C,D, by the polarizing beam splitter based on the polarization. It results in entanglement between the mode A and mode B or mode A and mode D in turn depending the input relative phase between two input two-mode squeezed lights or the quadrature components of squeezing. Thus, switching EPR beams with continuous variable are obtained.

DOI
10.1109/qels.2002.1031405

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Summary form only given. The scheme for continuous variable switch teleportation was proposed by using a pair of two-mode squeezed state lights on beamsplitter of 50% and polarizing beam splitter. Teleportation ability is examined by the criteria proposed by Ralph and Lam (1998) from a small signal quantum optical point of view. A pair of two-mode squeezed lights, which are coupled by two modes with identical frequency but orthogonal polarization, are mixed on a 50:50 beamsplitter. The outgoing fields are separated into A,B,C,D, by the polarizing beam splitter based on the polarization. It results in entanglement between the mode A and mode B or mode A and mode D in turn depending the input relative phase between two input two-mode squeezed lights or the quadrature components of squeezing. Thus, switching EPR beams with continuous variable are obtained.
A novel quantum switch for continuous variables teleportation is proposed. Two pairs of EPR beams with identical frequency and constant phase relation are composed on two beamsplitters to produce two pairs of conditional entangled beams, two of which are sent to two sending stations(Alices) and others to two receiving stations(bobs). The EPR entanglement initionally results from two-mode quadrature squeezed state light. Converting the squeezed component of one of EPR sources between amplitude and phase, the input quantum state at a sender will be reproduced at two receivers in turn. The switching system manipulated by squeezed state light might be developed as a practical quantum switch device for the communication and teleportation of quantum information.
We propose a quantum teleportation scheme in which a quantum state is teleported from the sending station (Alice) to either of two receiving stations (Bob1, Bob2). In this scheme, two pairs of EPR beams with identical frequency and constant phase relation are used to produce two pairs of conditional entangled beams by composing their modes on two beamsplitters. One output of a beamsplitter is sent to Alice and the two outputs of the other beamsplitter are sent to Bob1 and Bob2. Which receiving station actually receives the teleported state can be decided by correlating the in-phase or out-of-phase quadrature components of two two-mode squeezed vacuum states. The switch system manipulated by squeezed state light might be developed as a practical quantum switch device for the communication and teleportation of quantum information.
Abstract We theoretically implement the protocol of continuous variable quantum teleportation wherein Alice and Bob share a state built by a linear beam splitter as general two-mode Gaussian entangled state. Using the non-classicality and purity of the two single-mode Gaussian states employed initially at the input of the beam splitter, the unknown state teleportation protocol is explicitly implemented in terms of squeezing and phase space quadratures. We show that fidelity of the teleported state is maximal when the gain factor g is equal to 1 and gradually decreases when g deviates from 1 on either side. We further find that teleportation fidelity decreases when one of the input states of the beam splitter is replaced by the state of thermal photons.
Summary form only given. Two pairs of EPR beams with identical frequency and constant phase relation are composed on two beamsplitters to produce two pairs of conditional entangled beams, two halves of which are sent to two sending stations (Alices) and others to two receiving stations (Bobs). The EPR entangled beams initially result from two-mode quadrature squeezed state light produced by, for example, two nondegenerate optical parametric oscillators (NOPO) pumped by a same laser. Converting the squeezed component of one of the EPR sources between amplitude and phase, the input quantum state at a sender will be reproduced at two receivers in turn. The quantum switching performance between two receivers is only manipulated by the squeezed component of a two-mode squeezed state light, which can be experimentally demonstrated by controlling the parametric process either in amplification or deamplification.
Summary form only given. Quantum teleportation, first proposed as a method for teleporting an unknown spin-1/2 quantum state from a sender, "Alice", to a receiver, "Bob", has been extended to continuous-variable quantum teleportation (CVQT). In this variant of quantum teleportation, Bob and Alice share a nonlocal entangled two-mode field which, ideally, should have perfect correlations between in-phase quadrature ('position' x) and out-of-phase quadrature ('momentum' p), although the requirement of perfect correlations can be relaxed somewhat. The experimental success of CVQT has recently been reported, with two-mode squeezed light providing the nonlocal, entangled source shared between Alice and Bob. The objective here is to consider whether CVQT has indeed been achieved, or could ever be achieved, in optical experiments employing conventional laser sources. In particular we show that, in the context of this experiment, Alice and Bob may not employ independent laser sources for their operations if the state is to be teleported, yet this requires them to share more than just the Einstein-Podolsky-Rosen (EPR) resource.
We consider two-mode squeezed states which are parametrized by the squeezing parameter and the phase. We present a scheme for teleporting such entangled states of continuous variables from Alice to Bob. Our protocol is operationalized through the creation of a four-mode entangled state shared by Alice and Bob using linear amplifiers and beam splitters. Teleportation of the entangled state proceeds with local operations and the classical communication of four bits. We compute the fidelity of teleportation and find that it exhibits a trade-off with the magnitude of entanglement of the resultant teleported state.