Langenfeld Stefan, Welte Stephan, Hartung Lukas, Daiss Severin, Thomas Philip, Morin Olivier, Distante Emanuele, Rempe Gerhard
Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
Phys Rev Lett. 2021 Apr 2;126(13):130502. doi: 10.1103/PhysRevLett.126.130502.
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[over ¯]=(88.3±1.3)% at a rate of 6 Hz over 60 m.
量子隐形传态能够通过有损信道确定性地交换量子比特。虽然人们普遍认为无条件隐形传态需要预先共享的纠缠量子比特对，但在此我们展示了一种原则上无条件的协议，该协议仅需要单个光子作为事前准备好的资源。光子首先与接收器相继相互作用，然后与发送方量子比特存储器相互作用。对其进行探测，随后进行经典通信，预示着隐形传态成功。我们在60米的距离上以6赫兹的速率成功隐形传态了六个相互无偏的量子比特态，平均保真度F̅ = (88.3±1.3)% 。
