Department of Electrical Engineering and Electronics, The University of Liverpool, Brownlow Hill, Liverpool, L69 3GJ, United Kingdom.
Phys Rev Lett. 2011 Dec 23;107(26):260503. doi: 10.1103/PhysRevLett.107.260503. Epub 2011 Dec 22.
In this Letter we consider the purification of a quantum state using the information obtained from a continuous measurement record, where the classical measurement record is digitized to a single bit per measurement after the measurements have been made. Analysis indicates that efficient and reliable state purification is achievable for one- and two-qubit systems. We also consider quantum feedback control based on the discrete one-bit measurement sequences.
在这封信中，我们考虑使用从连续测量记录中获得的信息来纯化量子态，其中在进行测量后，经典测量记录被数字化为每个测量一个比特。分析表明，对于单量子比特和双量子比特系统，可以实现高效和可靠的态纯化。我们还考虑了基于离散单比特测量序列的量子反馈控制。
