Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory

Abstract

Quantum teleportation1 is a cornerstone of quantum information science due to its essential role in important tasks such as the long-distance transmission of quantum information using quantum repeaters2, 3. This requires the efficient distribution of entanglement between remote nodes of a network4. Here, we demonstrate quantum teleportation of the polarization state of a telecom-wavelength photon onto the state of a solid-state quantum memory. Entanglement is established between a rare-earth-ion-doped crystal storing a single photon that is polarization-entangled with a flying telecom-wavelength photon5, 6. The latter is jointly measured with another flying polarization qubit to be teleported, which heralds the teleportation. The fidelity of the qubit retrieved from the memory is shown to be greater than the maximum fidelity achievable without entanglement, even when the combined distances travelled by the two flying qubits is 25 km of standard optical fibre. Our results demonstrate the possibility of long-distance quantum networks with solid-state resources

Optically probing the detection mechanism in a molybdenum silicide superconducting nanowire single-photon detector

“…1, 2 An SNSPD consists of a thin wire of superconducting material biased close to its critical current, which becomes resistive after the absorption of a single photon, leading to a detection through an amplified voltage pulse. Their low dark count rate, fast response time, small jitter, and high efficiency favour their use in various demanding quantum optics applications such as quantum key distribution, 3 quantum networking, 4 device-independent quantum information processing 5 and deep-space optical communication. 6 Notably, SNSPDs can be integrated into photonic circuits, 7,8 and their applications extend beyond quantum optics, including light detection and ranging, 9 integrated circuit testing, 10 and fiber optic sensing.…”

Rare-earth doped transparent ceramics for spectral filtering and quantum information processing

“…C Trivalent rare-earth ions doped into single crystals have optical transitions that can exhibit very narrow homogeneous and inhomogeneous linewidths in which deep spectral holes can be burned at liquid helium temperatures. 1 Due to these properties, such materials are of great interest for application in quantum information processing (QIP) [2][3][4][5] and spectral filtering. The latter includes radio frequency signal analysis, 6,7 highly stable laser-locking, 8,9 and ultrasound optical tomography (UOT).…”

Quantum-teleportation experiments turn 20

“…For instance, it was realized that the process could enable quantum communication over arbitrarily large distances, thanks to devices called quantum repeaters 10 , or communication in space. Earlier this year, quantum teleportation was demonstrated between a satellite and a ground station in China 11 , over distances of up to 1,400 kilometres.…”