ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels (Barcelona), Spain.
ICREA-Institució Catalana de Recerca i Estudis Avançats, 08015, Barcelona, Spain.
Nat Commun. 2023 Apr 5;14(1):1889. doi: 10.1038/s41467-023-37518-5.
Quantum teleportation is an essential capability for quantum networks, allowing the transmission of quantum bits (qubits) without a direct exchange of quantum information. Its implementation between distant parties requires teleportation of the quantum information to matter qubits that store it for long enough to allow users to perform further processing. Here we demonstrate long distance quantum teleportation from a photonic qubit at telecom wavelength to a matter qubit, stored as a collective excitation in a solid-state quantum memory. Our system encompasses an active feed-forward scheme, implementing a conditional phase shift on the qubit retrieved from the memory, as required by the protocol. Moreover, our approach is time-multiplexed, allowing for an increase in the teleportation rate, and is directly compatible with the deployed telecommunication networks, two key features for its scalability and practical implementation, that will play a pivotal role in the development of long-distance quantum communication.
量子隐形传态是量子网络的基本能力，允许在不直接交换量子信息的情况下传输量子位（qubit）。在远程各方之间实现它需要将量子信息传送到存储它的物质量子位，以便存储足够长的时间以允许用户进行进一步的处理。在这里，我们演示了从电信波长的光子量子位到存储为固态量子存储器中集体激发的物质量子位的远距离量子隐形传态。我们的系统包括一个主动前馈方案，根据协议要求，对从存储器中检索到的量子位实施条件相移。此外，我们的方法是时分复用的，允许提高隐形传态的速率，并且与已部署的电信网络直接兼容，这是其可扩展性和实际实现的两个关键特征，将在长距离量子通信的发展中发挥关键作用。
