Quantum Teleportation between Remote Qubit Memories with Only a Single Photon as a Resource

Abstract

Quantum teleportation enables the deterministic exchange of qubits via lossy channels. While it is commonly believed that unconditional teleportation requires a preshared entangled qubit pair, here we demonstrate a protocol that is in principle unconditional and requires only a single photon as an ex-ante prepared resource. The photon successively interacts, first, with the receiver and then with the sender qubit memory. Its detection, followed by classical communication, heralds a successful teleportation. We teleport six mutually unbiased qubit states with average fidelity F = (88.3 ± 1.3)% at a rate of 6 Hz over 60 m.

Qubit teleportation between non-neighboring nodes in a quantum network

“…At the same time, shortening the detection windows of the two-node entanglement generation is expected to yield an improvement in the fidelity, as discussed above. We find indeed that the average unconditional teleportation fidelity increases with shorter window lengths, reaching F =0.688 (10) for a length of 7.5 ns and a rate of 1/(100 s). The current quantum network is thus able to perform teleportation beyond the classical bound, even under the strict condition that every state inserted into the teleporter be transferred.…”

“…We identify two separate regimes: one during the optical pulse (purple) and one after the optical pulse (yellow). When a photon is detected on Alice's (Bob's) PSB detector during the optical pulse we see that the outcome 01 (10) is most probable (purple data in Figure 2c) showing that only one setup was in the |0 state and thus that both detected photons originated from Alice (Bob). The detection of PSB photons during the optical pulse thus primarily flags double excitation errors.…”

“…Pioneering explorations of quantum teleportation protocols were performed using photonic states [5][6][7]. Following the development of quantum network nodes with stationary qubits, remote qubit teleportation was realized between trapped ions [8], trapped atoms [9,10], diamond NV centers [11] and memory nodes based on atomic ensembles [12].…”

Analysis of Multipartite Entanglement Distribution using a Central Quantum-Network Node

“…A quantum network is capable of distributing entangled quantum states between end nodes that are possibly separated by large distances [1][2][3][4]. The development of quantum networks is an active field of research, with recent milestones including the distribution of entanglement over 1203 kilometers using a satellite [5], quantum teleportation without using a preshared entangled state [6], the generation of light-matter entanglement over 50 kilometers of optical fiber through the use of quantum frequency conversion [7], and the creation of the first three-node quantum network [8].…”

Remote sensing and faithful quantum teleportation through non-localized qubits

“…First highlighted by Bennett et al [2], it has since evolved into an active and interesting area of research and is now recognized as an significant tool for many quantum protocols such as measurement-based quantum computing [3], quantum repeaters [4], and fault-tolerant quantum computation [5]. The experiments have been first implemented by photons [6], later with various systems such as trapped ions [7,8], atomic ensembles [9], as well as with high-frequency phonons [10] and several others [11][12][13][14].…”