Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:quant-ph/0501086 · Physical Review Letters

High-Fidelity Teleportation beyond the No-Cloning Limit and Entanglement Swapping for Continuous Variables

Nobuyuki Takei, Hidehiro Yonezawa, Takao Aoki, Akira Furusawa

Published Jun 8, 2005• 241 citations
arXivHTMLPDF

Abstract

We experimentally demonstrate continuous-variable quantum teleportation beyond the no-cloning limit. We teleport a coherent state and achieve the fidelity of 0.70 +/- 0.02 that surpasses the no-cloning limit of 2/3. Surpassing the limit is necessary to transfer the nonclassicality of an input quantum state. By using our high-fidelity teleporter, we demonstrate entanglement swapping, namely, teleportation of quantum entanglement, as an example of transfer of nonclassicality.

DOI
10.1103/physrevlett.94.220502

Related papers

High-fidelity quantum teleportation toward cubic phase gates beyond the no-cloning limit

Qingwei Wang, Yuhang Tian, Wei Li +3 more

High-fidelity quantum teleportation is necessary to configure a cubic phase gate that enables the processing of the nonclassicality in an input quantum state. The noise variance of the antisqueezing component, which increases rapidly with a higher pump factor, contaminates the squeezing component due to the phase fluctuation and results in a reduction of the fidelity. Here, we balance the influence of the extraction loss and phase fluctuation on the fidelity and optimize the performance of quantum teleportation. As a result, a fidelity $F=0.905\ifmmode\pm\else\textpm\fi{}0.022$ is experimentally achieved. The ultrahigh fidelity is expected to configure a cubic phase gate involving four-time sequential teleportation to perform universal continuous-variable quantum information processing.

Physical Review A•Jun 28, 2021•17 citations

Experimental investigation of continuous-variable quantum teleportation

Warwick P. Bowen, Nicolas Treps, B. C. Buchler +5 more

We report the experimental demonstration of quantum teleportation of the quadrature amplitudes of a light field. Our experiment was stably locked for long periods, and was analyzed in terms of fidelity $\mathcal{F}$ and with signal transfer ${T}_{q}{=T}^{+}{+T}^{\ensuremath{-}}$ and noise correlation ${V}_{q}{=V}_{\mathrm{in}\mathrm{|}\mathrm{}\mathrm{out}}^{+}{V}_{\mathrm{in}\mathrm{|}\mathrm{}\mathrm{out}}^{\ensuremath{-}}.$ We observed an optimum fidelity of $0.64\ifmmode\pm\else\textpm\fi{}0.02,$ ${T}_{q}=1.06\ifmmode\pm\else\textpm\fi{}0.02,$ and ${V}_{q}=0.96\ifmmode\pm\else\textpm\fi{}0.10.$ We discuss the significance of both ${T}_{q}>1$ and ${V}_{q}<1$ and their relation to the teleportation no-cloning limit.

arXiv:quant-ph/0207179•Physical Review A•Mar 10, 2003•336 citations

Transfer of squeezed coherent state using quantum teleportation of continuous variables

Aoi Fujimoto, Hiroyuki Ichihara

Quantum entanglement states in continuous-variable quantum teleportation can transfer any quantum state. However, errors occur in the quantum states before and after the transfer in scientific experiments because generating a perfect quantum entanglement is physically unattainable. This paper limits the quantum states transferred to squeezed coherent states and introduces a controller to classical information transfer in continuous-variable quantum teleportation to improve transfer accuracy. Under such a setup, we derived the optimal controller that maximizes the fidelity, independent of the measurement results and the value of the displacement of the squeezed coherent state.

SICE Journal of Control Measurement and System Integration•Jun 7, 2024•0 citations

Criteria for Continuous-Variable Quantum Teleportation

Braunstein, S L, Christopher A. Fuchs, Kimble, H J

We derive an experimentally testable criterion for the teleportation of quantum states of continuous variables. This criterion is especially relevant to the recent experiment of Furusawa et al. [Science 282, 706-709 (1998)] where an input-output fidelity of $0.58 \\pm 0.02$ was achieved for optical coherent states. Our derivation demonstrates that fidelities greater than 1/2 could not have been achieved through the use of a classical channel alone; quantum entanglement was a crucial ingredient in the experiment.

•Oct 8, 1999•114 citations

High-Fidelity Teleportation of Continuous-Variable Quantum States Using Delocalized Single Photons

Ulrik L. Andersen, Timothy C. Ralph

Traditional continuous-variable teleportation can only approach unit fidelity in the limit of an infinite (and unphysical) amount of squeezing. We describe a new method for continuous-variable teleportation that approaches unit fidelity with finite resources. The protocol is not based on squeezed states as in traditional teleportation but on an ensemble of single photon entangled states. We characterize the teleportation scheme with coherent states, mesoscopic superposition states, and two-mode squeezed states and we find several situations in which near-unity teleportation fidelity can be obtained with modest resources.

arXiv:1302.1359•Physical Review Letters•Aug 2, 2013•69 citations

Criteria of Quantum Teleportation for Different Continuous Variables

Kunchi Peng

The state evolution of quantum teleportation for different types of continuous variables is mathematically analyzed based on the measurement theory of quantum mechanics.The fidelities in different systems are deduced.Our results show that for different input state the expressions of fidelity and the nonclassical boundary are different.Comparing with the coherent state,when the input state is a nonclassical state higher quantum entanglement is required for obtaining the same fidelity.

Journal of Shanxi University•Jan 1, 2002•0 citations
We experimentally demonstrate continuous-variable quantum teleportation beyond the no-cloning limit. We teleport a coherent state and achieve the fidelity of 0.70 +/- 0.02 that surpasses the no-cloning limit of 2/3. Surpassing the limit is necessary to transfer the nonclassicality of an input quantum state. By using our high-fidelity teleporter, we demonstrate entanglement swapping, namely, teleportation of quantum entanglement, as an example of transfer of nonclassicality.
High-fidelity quantum teleportation is necessary to configure a cubic phase gate that enables the processing of the nonclassicality in an input quantum state. The noise variance of the antisqueezing component, which increases rapidly with a higher pump factor, contaminates the squeezing component due to the phase fluctuation and results in a reduction of the fidelity. Here, we balance the influence of the extraction loss and phase fluctuation on the fidelity and optimize the performance of quantum teleportation. As a result, a fidelity $F=0.905\ifmmode\pm\else\textpm\fi{}0.022$ is experimentally achieved. The ultrahigh fidelity is expected to configure a cubic phase gate involving four-time sequential teleportation to perform universal continuous-variable quantum information processing.
We report the experimental demonstration of quantum teleportation of the quadrature amplitudes of a light field. Our experiment was stably locked for long periods, and was analyzed in terms of fidelity F\mathcal{F}F and with signal transfer ${T}_{q}{=T}^{+}{+T}^{\ensuremath{-}}$ and noise correlation ${V}_{q}{=V}_{\mathrm{in}\mathrm{|}\mathrm{}\mathrm{out}}^{+}{V}_{\mathrm{in}\mathrm{|}\mathrm{}\mathrm{out}}^{\ensuremath{-}}.$ We observed an optimum fidelity of $0.64\ifmmode\pm\else\textpm\fi{}0.02,$ ${T}_{q}=1.06\ifmmode\pm\else\textpm\fi{}0.02,$ and ${V}_{q}=0.96\ifmmode\pm\else\textpm\fi{}0.10.$ We discuss the significance of both Tq>1{T}_{q}>1Tq​>1 and Vq<1{V}_{q}<1Vq​<1 and their relation to the teleportation no-cloning limit.
Quantum entanglement states in continuous-variable quantum teleportation can transfer any quantum state. However, errors occur in the quantum states before and after the transfer in scientific experiments because generating a perfect quantum entanglement is physically unattainable. This paper limits the quantum states transferred to squeezed coherent states and introduces a controller to classical information transfer in continuous-variable quantum teleportation to improve transfer accuracy. Under such a setup, we derived the optimal controller that maximizes the fidelity, independent of the measurement results and the value of the displacement of the squeezed coherent state.
We derive an experimentally testable criterion for the teleportation of quantum states of continuous variables. This criterion is especially relevant to the recent experiment of Furusawa et al. [Science 282, 706-709 (1998)] where an input-output fidelity of 0.58pm0.020.58 \\pm 0.020.58pm0.02 was achieved for optical coherent states. Our derivation demonstrates that fidelities greater than 1/2 could not have been achieved through the use of a classical channel alone; quantum entanglement was a crucial ingredient in the experiment.
Traditional continuous-variable teleportation can only approach unit fidelity in the limit of an infinite (and unphysical) amount of squeezing. We describe a new method for continuous-variable teleportation that approaches unit fidelity with finite resources. The protocol is not based on squeezed states as in traditional teleportation but on an ensemble of single photon entangled states. We characterize the teleportation scheme with coherent states, mesoscopic superposition states, and two-mode squeezed states and we find several situations in which near-unity teleportation fidelity can be obtained with modest resources.