使用多模量子剪刀传送光子量子
Teleporting photonic qudits using multimode quantum scissors
摘要：
隐形传态在量子网络节点之间的量子信息通信中起着重要的作用，被认为是长距离量子密码的重要组成部分。我们描述了一种方法，通过基于转录的$d$附加光子的帮助，在多个$d$光模式的叠加（“qudit”）中传送光子携带的量子信息。被编码为$d$光模式（在我们的情况下，携带轨道角动量的拉盖尔-高斯模式）的单次激发的量子比特被转录为空间分离的$d$单轨光子量子比特。每个单轨量子比特由真空和每个模式中的单个光子的叠加组成。在通过“量子剪刀”成功地传送每个$d$单轨量子比特之后，它们被转换回由单个光子携带的量子比特，从而完成传送方案。
英文摘要：
Teleportation plays an important role in the communication of quantum information between the nodes of a quantum network and is viewed as an essential ingredient for long-distance Quantum Cryptography. We describe a method to teleport the quantum information carried by a photon in a superposition of a number $d$ of light modes (a "qudit") by the help of $d$ additional photons based on transcription. A qudit encoded into a single excitation of $d$ light modes (in our case Laguerre-Gauss modes which carry orbital angular momentum) is transcribed to $d$ single-rail photonic qubits, which are spatially separated. Each single-rail qubit consists of a superposition of vacuum and a single photon in each one of the modes. After successful teleportation of each of the $d$ single-rail qubits by means of "quantum scissors" they are converted back into a qudit carried by a single photon which completes the teleportation scheme.
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