Enhancing quantum teleportation efficacy with noiseless linear amplification

Jie Zhao, Hao Jeng, Lorcán O. Conlon, Spyros Tserkis, Biveen Shajilal, Kui Liu, Timothy C. Ralph, Syed M. Assad and Ping Koy Lam ()
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Jie Zhao: The Australian National University
Hao Jeng: The Australian National University
Lorcán O. Conlon: The Australian National University
Spyros Tserkis: The Australian National University
Biveen Shajilal: The Australian National University
Kui Liu: Shanxi University
Timothy C. Ralph: University of Queensland
Syed M. Assad: The Australian National University
Ping Koy Lam: The Australian National University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Quantum teleportation constitutes a fundamental tool for various applications in quantum communication and computation. However, state-of-the-art continuous-variable quantum teleportation is restricted to moderate fidelities and short-distance configurations. This is due to unavoidable experimental imperfections resulting in thermal decoherence during the teleportation process. Here we present a heralded quantum teleporter able to overcome these limitations through noiseless linear amplification. As a result, we report a high fidelity of 92% for teleporting coherent states using a modest level of quantum entanglement. Our teleporter in principle allows nearly complete removal of loss induced onto the input states being transmitted through imperfect quantum channels. We further demonstrate the purification of a displaced thermal state, impossible via conventional deterministic amplification or teleportation approaches. The combination of high-fidelity coherent state teleportation alongside the purification of thermalized input states permits the transmission of quantum states over significantly long distances. These results are of both practical and fundamental significance; overcoming long-standing hurdles en route to highly-efficient continuous-variable quantum teleportation, while also shining new light on applying teleportation to purify quantum systems from thermal noise.

Date: 2023
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DOI: 10.1038/s41467-023-40438-z

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