Quantum teleportation over 100 km of fiber using highly-efficient superconducting nanowire single photon detectors

TL;DR

This paper demonstrates successful quantum teleportation over 100 km of optical fiber by employing highly-efficient superconducting nanowire single-photon detectors, overcoming previous detection efficiency limitations.

Contribution

The study introduces the use of four high-efficiency SNSPDs based on MoSi for quantum teleportation over long distances in fiber, enabling high-fidelity multi-photon measurements.

Findings

Quantum teleportation achieved over 100 km fiber

High detection efficiency of SNSPDs enabled successful teleportation

Multi-photon detection efficiency improved significantly

Abstract

Quantum teleportation is an essential quantum operation by which we can transfer an unknown quantum state to a remote location with the help of quantum entanglement and classical communication. Since the first experimental demonstrations using photonic qubits and continuous variables, the distance of photonic quantum teleportation over free space channels has continued to increase and has reached >100 km. On the other hand, quantum teleportation over optical fiber has been challenging, mainly because the multi-fold photon detection that inevitably accompanies quantum teleportation experiments has been very inefficient due to the relatively low detection efficiencies of typical telecom-band single photon detectors. Here, we report efficient quantum teleportation over optical fiber using four high-detection efficiency superconducting nanowire superconducting single-photon detectors (SNSPD) based on MoSi. These SNSPDs make it possible to perform highly-efficient multi-fold photon measurements, allowing us to confirm that the quantum states of input photons were successfully teleported over 100 km of fiber.