scholarly journals Average fidelity and fidelity deviation in noisy quantum teleportation

2021 ◽  
Author(s):  
Wooyeong Song ◽  
Junghee Ryu ◽  
Kyunghyun Baek ◽  
Jeongho Bang
Keyword(s):  
Quantum Teleportation ◽  
Average Fidelity

Quantum teleportation via two-qubit Heisenberg XYZ chain

2014 ◽  
Vol 92 (5) ◽  
pp. 406-410 ◽  
Author(s):  
Nour Zidan
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Teleportation ◽  
Initial System ◽  
Entangled State ◽  
Initial State ◽  
Intrinsic Decoherence ◽  
Average Fidelity ◽  
Moriya Interaction

Quantum teleportation via the entanglement channel composed of a two-qubit Heisenberg XYZ chain with Dzyaloshinskii–Moriya interaction in the presence of both inhomogeneous external magnetic field and intrinsic decoherence has been investigated. It is shown that the initial state of the channel plays an important role in the fully entangled fraction and the average fidelity of teleportation. It is found that when the initial system is in the entangled state |Ψ⟩ = m2|01⟩ + n2|10⟩ the corresponding average fidelity is always larger than 2/3.

QUANTUM TELEPORTATION VIA 1D OPTICAL LATTICE CHAINS WITH NONLINEAR COUPLING

2008 ◽  
Vol 06 (06) ◽  
pp. 1213-1222
Author(s):  
JIN-LIANG GUO ◽  
JIE SONG ◽  
HE-SHAN SONG
Keyword(s):  
Magnetic Field ◽  
Optical Lattice ◽  
Quantum Teleportation ◽  
Uniform Magnetic Field ◽  
Communication Protocol ◽  
Nonlinear Coupling ◽  
Classical Communication ◽  
Average Fidelity ◽  
Linear Coupling ◽  
External Uniform Magnetic Field

We study quantum teleportation by using 1D optical lattice for two particles with nonlinear coupling in an external uniform magnetic field as resources via the standard teleportation protocol T0. The effects of linear coupling J, nonlinear coupling K and magnetic field B on the average fidelity are investigated in detail. It is found that increasing |K| is not only very helpful for enhancing the average fidelity, but also beneficial to improving the critical temperature Tf and magnetic field Bf, beyond which quantum teleportation is inferior to classical communication protocol.

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.

HEAT-BATH-INDUCED DECAY OF TELEPORTATION FIDELITY OF THE X-STATES

2012 ◽  
Vol 26 (15) ◽  
pp. 1250097 ◽  
Author(s):  
MENG QIN ◽  
XUAN CHEN ◽  
CUI-CUI LIU
Keyword(s):  
Quantum Entanglement ◽  
Quantum Teleportation ◽  
Occupation Number ◽  
Heat Bath ◽  
Initial State ◽  
Average Fidelity ◽  
The Mean ◽  
Initial States ◽  
Analytical Expressions

Quantum entanglement and teleportation of two qubit X-states subject to heat bath is investigated by partial teleportation protocol. We obtain the analytical expressions of the average fidelity for the X-states with one-side decoherence and two-side decoherence. The quality of quantum teleportation with various initial states is investigated by explicitly calculating the concurrence, the output concurrence and the average fidelity. The results demonstrate that the model is suitable for teleportation, which depends on the initial state. However, the mean thermal occupation number of bath and decoherence could induce the decrease of the output entanglement and the average fidelity in the quantum teleportation processing. We also find the quantum teleportation protocol of one-side decoherence is more robust than that of under two-side decoherence.

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.

Dynamics of quantum correlations in quantum teleportation

2020 ◽  
Vol 34 (10) ◽  
pp. 2050093
Author(s):  
K. El Anouz ◽  
I. El Aouadi ◽  
A. El Allati ◽  
T. Mourabit
Keyword(s):  
Quantum Teleportation ◽  
Quantum Correlation ◽  
Quantum Discord ◽  
Information Source ◽  
Dynamical Evolution ◽  
Single Mode ◽  
Quantum Correlations ◽  
Entangled State ◽  
Average Fidelity ◽  
Level Atom

A scheme of quantum teleportation using Jaynes–Cummings model is proposed. It consists of using a partial entangled state generated from the interaction between a two-level atom and single mode of radiation field as a quantum channel. By controlling the number of photons inside cavity and detuning parameter, the dynamical evolution of quantum correlation and entanglement degree in terms of quantum discord and concurrence, respectively, in the nonresonance case are investigated. Moreover, a comparative study between the teleported entanglement, teleported quantum correlation and average fidelity shows a good similarity between their dynamical evolution. Consequently, we conclude that quantum discord may be considered as a good information source in quantum teleportation process.

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.

scholarly journals ENHANCED QUANTUM TELEPORTATION IN NON-MARKOVIAN ENVIRONMENTS

2012 ◽  
Vol 10 (05) ◽  
pp. 1250051 ◽  
Author(s):  
XIANG HAO ◽  
SHIQUN ZHU
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Memory Effects ◽  
Qubit State ◽  
Average Fidelity ◽  
Better Than

The protocol of the teleportation of an arbitrary unknown one-qubit state is investigated when the quantum channel is subject to the decoherence from the non-Markovian environments with the memory effects. The quality of the teleportation measured by the average fidelity and minimal fidelity can be enhanced in the non-Markovian channel. The memory effects give rise to the revival of the fidelity which is better than that obtained by the Markovian channel.

Quantum teleportation in a three-qubit Heisenberg chain with Dzyaloshinsky–Moriya interaction

2015 ◽  
Vol 29 (20) ◽  
pp. 1550107 ◽  
Author(s):  
Yu-Xing Xi ◽  
Yan-Xia Huang
Keyword(s):  
Magnetic Field ◽  
Quantum Teleportation ◽  
Homogeneous Magnetic Field ◽  
Spin Chains ◽  
Coupling Coefficients ◽  
Heisenberg Chain ◽  
Average Fidelity ◽  
Heisenberg Spin ◽  
Heisenberg Spin Chains ◽  
Moriya Interaction

The quantum teleportation via thermally entangled states of three-qubit Heisenberg spin chains with Dzyaloshinsky–Moriya (DM) interactions under a homogeneous magnetic field has been investigated. It is found that average fidelity and critical temperature depend on not only temperature, magnetic field, but also coupling coefficients, and DM interactions. What is more, we also find that average fidelity has little to do with entanglement.

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