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Quantum 2.0 Conference and Exhibition

Multi-Color Continuous Variables Unconditional Quantum Teleportation: From Near-Infrared to Telecommunications’ L-Band

Felipe Lucas Gewers, Gabriel C. Borba, Beatriz Moura, Túlio Brito Brasil, Rayssa Bruzaca de Andrade, R. Medeiros de Araújo, Igor Konieczniak, P. Nussenzveig, M. Martinelli

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We demonstrate an unconditional quantum teleportation system between Rubidium D1 line and telecommunications’ L-band. For a coherent input state, a fidelity of ℱ = 56.2(5)% was achieved.
DOI
10.1364/cleo_fs.2026.fth3d.7

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Quantum teleportation of optical coherent states was demonstrated experimentally using squeezed-state entanglement. The quantum nature of the achieved teleportation was verified by the experimentally determined fidelity Fexp = 0.58 +/- 0.02, which describes the match between input and output states. A fidelity greater than 0.5 is not possible for coherent states without the use of entanglement. This is the first realization of unconditional quantum teleportation where every state entering the device is actually teleported.
Quantum teleportation is the basis for numerous quantum applications, with the continuous-variable (CV) protocol having the significant advantage of being unconditional and deterministic, allowing every input state to be teleported. In the context of quantum networks, quantum channels connecting different wavelengths can be used in quantum hybrid technologies, linking different quantum platforms with distinct purposes that interact with light at specific wavelengths. Our approach to building these continuous-variable quantum channels is through quantum teleportation between quadratures of fields at widely different frequencies. To achieve this, we employ a triply resonant optical parametric oscillator (TROPO) operating above threshold as a source of two-mode entangled states. Pumped by a 532 nm Nd:YAG second harmonic laser, the system generates intense beams at 794.4(4) nm (377 THz; near-infrared compatible with the rubidium D1 line) and 1611(3) nm (186 THz; telecommunication L-band), with a frequency separation of 191 THz, which is over one octave. Using the resonator-assisted auto-homodyne technique, we implement the teleportation protocol to transfer a displaced coherent state from the infrared to the telecommunication band. In this work, we report the first demonstration of multi-color continuous-variable (CV) quantum teleportation bridging distinct frequency bands. This also marks the first implementation of teleportation between the sideband modes of intense beams that surpasses the classical fidelity limit. Additionally, we provide the first full characterization of the individual sideband modes in widely separated signal and idler fields generated by an above-threshold optical parametric oscillator. This demonstration paves the way for the development of hybrid quantum systems with enhanced connectivity.
We demonstrate a sequence of two quantum teleportations of optical coherent states, combining two high-fidelity teleporters for continuous variables. In our experiment, the individual teleportation fidelities are evaluated as ${F}_{1}=0.70\ifmmode\pm\else\textpm\fi{}0.02$ and ${F}_{2}=0.75\ifmmode\pm\else\textpm\fi{}0.02$, while the fidelity between the input and the sequentially teleported states is determined as ${F}^{(2)}=0.57\ifmmode\pm\else\textpm\fi{}0.02$. This still exceeds the optimal fidelity of one half for classical teleportation of arbitrary coherent states and almost attains the value of the first (unsequential) quantum teleportation experiment with optical coherent states.