Lim Yuan Liang, Beige Almut, Kwek Leong Chuan
Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BZ, United Kingdom.
Phys Rev Lett. 2005 Jul 15;95(3):030505. doi: 10.1103/PhysRevLett.95.030505. Epub 2005 Jul 13.
We demonstrate the possibility to perform distributed quantum computing using only single-photon sources (atom-cavity-like systems), linear optics, and photon detectors. The qubits are encoded in stable ground states of the sources. To implement a universal two-qubit gate, two photons should be generated simultaneously and pass through a linear optics network, where a measurement is performed on them. Gate operations can be repeated until a success is heralded without destroying the qubits at any stage of the operation. In contrast with other schemes, this does not require explicit qubit-qubit interactions, a priori entangled ancillas, nor the feeding of photons into photon sources.
我们展示了仅使用单光子源（类原子 - 腔系统）、线性光学器件和光子探测器来执行分布式量子计算的可能性。量子比特被编码在源的稳定基态中。为了实现一个通用的双量子比特门，应同时产生两个光子并使其通过一个线性光学网络，在该网络中对它们进行测量。门操作可以重复进行，直到宣告成功，且在操作的任何阶段都不会破坏量子比特。与其他方案不同的是，这不需要明确的量子比特 - 量子比特相互作用、先验纠缠的辅助量子比特，也不需要将光子注入光子源。
