近日，美国纽约大学物理研究所Tim Byrnes研究了量子比特集成的宏观量子隐形传态。相关论文于2025年4月16日发表在《物理评论A》杂志上。

研究组开发了使用量子非色散测量、自旋投影测量和经典通信对未知状态的总自旋变量进行量子隐形传态的方法。虽然从理论上讲，高维态的隐形传态可以通过广义贝尔测量的假设来实现，但这在实验上通常难以实现。他们介绍了两种协议，并表明平均而言，在理想情况下，隐形传态成功地隐形传态了自旋相干态的自旋变量，平均角度误差为零，击败了基于量子态估计的经典策略。

在单次传送中，对于大型系综，角度误差为约0.1弧度。该方案的一个潜在物理实现是利用光进行原子系综和量子非色散测量。研究组分析了协议的退相干性，发现即使在大集成大小的限制下，该协议也是鲁棒的。

附：英文原文

Title: Macroscopic quantum teleportation with ensembles of qubits

Author: Manish Chaudhary, Zhiyuan Lin, Shuang Li, Mohan Zhang, Yuping Mao, Valentin Ivannikov, Tim Byrnes

Issue&Volume: 2025/04/16

Abstract: We develop methods for performing quantum teleportation of the total spin variables of an unknown state, using quantum nondemolition measurements, spin projection measurements, and classical communication. While, theoretically, teleportation of high-dimensional states can be attained with the assumption of generalized Bell measurements, this is typically experimentally nontrivial to implement. We introduce two protocols and show that on average, the teleportation succeeds in teleporting the spin variables of a spin coherent state with average zero angular error in the ideal case, beating classical strategies based on quantum state estimation. In a single run of the teleportation, there is an angular error at the level of ～0.1 radians for large ensembles. A potential physical implementation for the scheme is with atomic ensembles and quantum nondemolition measurements performed with light. We analyze the decoherence of the protocols and find that the protocol is robust even in the limit of large ensemble sizes.

DOI: 10.1103/PhysRevA.111.042421

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.042421