TELEPORTATION OF THE MULTIPARTITE ENTANGLED STATES IN CONTINUOUS VARIABLE

2009 ◽  
Vol 07 (02) ◽  
pp. 505-515
Author(s):  
MIAN QIAO ◽  
YONG SUN ◽  
YUN JIE XIA
Keyword(s):  
Coherent State ◽  
Quantum Teleportation ◽  
Optical Devices ◽  
Continuous Variable ◽  
Phase Shifters ◽  
Entangled States ◽  
Average Fidelity ◽  
Beam Splitters ◽  
Entangled Coherent State ◽  
Photo Detectors

We propose a quantum teleportation scheme for tripartite entangled coherent state (ECS) in continuous variable by adopting disentanglement method. Our scheme is feasible and economical in the sense that we only need linear optical devices such as beam splitters, phase shifters and photo detectors and employ bipartite maximally ECS as quantum channel. We also generalize the tripartite scheme into multipartite case and calculate the minimum average fidelity for the schemes in tripartite and multipartite cases.

IMPROVING THE TELEPORTATION OF TRIPARTITE ENTANGLED COHERENT STATES IN CONTINUOUS VARIABLE

2009 ◽  
Vol 07 (01) ◽  
pp. 313-321 ◽  
Author(s):  
YONG SUN ◽  
BEN-JIN SUN ◽  
MEI-LI SHI ◽  
ZHONG-XIAO MAN ◽  
YUN-JIE XIA
Keyword(s):  
Coherent State ◽  
Continuous Variable ◽  
Phase Shifters ◽  
Entangled State ◽  
Quantum Channels ◽  
Average Fidelity ◽  
Beam Splitters ◽  
Entangled Coherent State ◽  
Tripartite Entangled State ◽  
Photo Detectors

We propose a feasible scheme for the quantum teleportation of tripartite entangled coherent state in terms of linear optical devices such as beam splitters, phase shifters and photo detectors. The scheme is based on the bipartite maximally entangled coherent state and the tripartite entangled coherent state with bipartite maximal entanglement as quantum channels. It shows that for an appreciable mean number of photons equal to 2, the total minimum of average fidelity for an arbitrary tripartite entangled state is 0.981684.

CONTINUOUS-VARIABLE QUANTUM TELEPORTATION OF MULTIPARTITE ENTANGLED COHERENT STATES

2011 ◽  
Vol 25 (08) ◽  
pp. 1135-1142 ◽  
Author(s):  
YONG SUN ◽  
BEN-JIN SUN ◽  
MEI-LI SHI ◽  
ZHONG-XIAO MAN ◽  
YUN-JIE XIA
Keyword(s):  
Quantum Teleportation ◽  
Optical Devices ◽  
Continuous Variable ◽  
Phase Shifters ◽  
Entangled State ◽  
Average Fidelity ◽  
Beam Splitters ◽  
Maximal Entanglement ◽  
Entangled Coherent State ◽  
Tripartite Entangled State

We investigate the problem of teleportation of tripartite entangled coherent state (ECS) using linear optical devices such as beam splitters, phase shifters, and two-mode number measurements. The scheme is based on the maximally four-partite ECS with bipartite maximal entanglement as the quantum channel to teleportation tripartite ECS. Our scheme is efficient in the sense that for mean number of photons equal to 2, the minimum of average fidelity (MAF) for teleportation an arbitrary tripartite entangled state is 1-2.3 × 10-7. We also generalize the tripartite scheme into multipartite case and calculate the MAF for the schemes in multipartite cases.

Quantum teleportation of a tripartite entangled coherent state

2021 ◽  
Author(s):  
Shivani A. Kumar
Keyword(s):  
Coherent State ◽  
Quantum Channel ◽  
Quantum Teleportation ◽  
Optical Devices ◽  
Phase Shifters ◽  
Quantum Model ◽  
Beam Splitters ◽  
Entangled Coherent State ◽  
Linear Optical

The present work proposes a scheme to teleport a tripartite coherent state using an unparalleled four-component state as a quantum channel. The scheme involves linear optical devices like beam splitters and phase shifters. It is shown that, even by taking an uncompromising quantum model, almost a complete teleportation can be achieved with an impressive number of photons. It is also shown that the teleportation fails only if zero photons are found in all the three output modes or zero in two output modes and a nonzero even/odd photon in one mode. However, the probability of getting these output modes is almost negligible.

Generation of cluster-type entangled coherent states using weak nonlinearities

2011 ◽  
Vol 11 (1&2) ◽  
pp. 124-141
Author(s):  
Nguyen B. An ◽  
Kisik Kim ◽  
Jaewan Kim
Keyword(s):  
Coherent States ◽  
Single Photon ◽  
Optical Devices ◽  
Phase Shifters ◽  
Intense Laser ◽  
Laser Beams ◽  
Beam Splitters ◽  
Photo Detectors ◽  
Cluster Type ◽  
Entangled Coherent States

We propose a scheme to generate a recently introduced type of entangled coherent states using realistic weak cross-Kerr nonlinearities and intense laser beams. An intense laser can be filtered to make a faint one to be used for production of a single photon which is necessary in our scheme. The optical devices used are conventional ones such as interferometer, mirrors, beam-splitters, phase-shifters and photo-detectors. We also provide a detailed analysis on the effects of possible imperfections and decoherence showing that our scheme is robust against such effects.

ENTANGLEMENT SWAPPING OF PAIR CAT STATES

2011 ◽  
Vol 09 (03) ◽  
pp. 993-1003
Author(s):  
YE-QI ZHANG ◽  
JING-BO XU
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Continuous Variable ◽  
Entanglement Swapping ◽  
Final States ◽  
Average Fidelity ◽  
Logarithmic Negativity ◽  
Squeezed Vacuum ◽  
Schrödinger Cat ◽  
Cat States

We investigate the entanglement swapping of the continuous variable states by taking the pair Schrödinger cat states as the input entangled states, in which the two-mode squeezed vacuum and the pair cat states serve as the quantum channel, respectively. The entanglement of the initial states as well as the final states is analyzed by adopting the logarithmic negativity as the measure of entanglement. The quantum teleportation task by exploiting the swapped states as the quantum channel is also considered, where a coherent state serves as the target state and the average fidelity is examined.

scholarly journals QUANTUM TELEPORTATION WITH PAIR-COHERENT STATES

2007 ◽  
Vol 05 (01n02) ◽  
pp. 17-22 ◽  
Author(s):  
AURÉL GÁBRIS ◽  
GIRISH S. AGARWAL
Keyword(s):  
Coherent State ◽  
Quantum Teleportation ◽  
Coherent States ◽  
Continuous Variable ◽  
Quantum Mechanical ◽  
Variable Theory ◽  
Hidden Variable ◽  
Mechanical Explanation ◽  
Pair Coherent State ◽  
Local Hidden Variable

Recently, it has been argued that all presently performed continuous variable quantum teleportation experiments could be explained using a local hidden variable theory. In this paper, we study a modification of the original protocol which requires a fully quantum mechanical explanation even when coherent states are teleported. Our calculations of the fidelity of teleportation using a pair-coherent state under ideal conditions suggest that fidelity above the required limit of 1/2 may be achievable in an experiment also.

EFFECT OF DECOHERENCE ON FIDELITY IN TELEPORTATION OF ENTANGLED COHERENT STATES

2008 ◽  
Vol 06 (05) ◽  
pp. 1077-1092 ◽  
Author(s):  
H. PRAKASH ◽  
N. CHANDRA ◽  
R. PRAKASH ◽  
SHIVANI
Keyword(s):  
Coherent State ◽  
Coherent States ◽  
Low Noise ◽  
Entangled States ◽  
Average Fidelity ◽  
High Noise ◽  
Maximum Value ◽  
Entangled Coherent States ◽  
Suggested Modification

We consider the scheme proposed by Wang [Phys. Rev. A64 (2001) 022302] for teleporting bipartite entangled states, which is a superposition of coherent states |α,α〉 and |-α,-α〉, with our suggested modification [Phys. Rev. A75 (2007) 044305] and discuss the effect of decoherence on teleportation fidelity. We find that if no photons are counted in both final outputs, the minimum assured fidelity (MAF), which is the minimum of the fidelity for any arbitrary information), is still nonzero except for the case when there is no decoherence and the information is in even coherent state. For non-zero photon counts, MAF decreases with increase in |α|2 for low noise but in the case of high noise, it increases, attains a maximum value and then decreases with |α|2. We discuss the variation of average fidelity with |α|2 and show that it depends appreciably on the information for low values of |α|2 only.

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