Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
QMATH, Department of Mathematical Sciences, University of Copenhagen, 2100 Copenhagen Ø, Denmark.
Phys Rev Lett. 2019 Aug 16;123(7):070504. doi: 10.1103/PhysRevLett.123.070504.
We propose a method for optical interferometry in telescope arrays assisted by quantum networks. In our approach, the quantum state of incoming photons along with an arrival time index are stored in a binary qubit code at each receiver. Nonlocal retrieval of the quantum state via entanglement-assisted parity checks at the expected photon arrival rate allows for direct extraction of the phase difference, effectively circumventing transmission losses between nodes. Compared to prior proposals, our scheme (based on efficient quantum data compression) offers an exponential decrease in required entanglement bandwidth. Experimental implementation is then feasible with near-term technology, enabling optical imaging of astronomical objects akin to well-established radio interferometers and pushing resolution beyond what is practically achievable classically.
我们提出了一种利用量子网络辅助的望远镜阵列进行光学干涉测量的方法。在我们的方法中，每个接收器将沿光束的入射光子的量子态和到达时间索引存储在二进制量子比特码中。通过在预期的光子到达率处利用纠缠辅助奇偶校验进行量子态的非局域提取，可以直接提取相位差，有效地避免了节点之间的传输损耗。与之前的方案相比，我们的方案（基于有效的量子数据压缩）可以显著减少所需的纠缠带宽。然后，实验实现是可行的，使用近期的技术，能够实现类似于成熟的射电干涉仪的天文物体的光学成像，并将分辨率推到经典方法实际可达到的范围之外。
