Quantum non-demolition measurements: a new resource for making linear logic

Nemoto, Kae ; Munro, W.J. ; Spiller, T.P. ; Beausoleil, R.G.

HP Development Company

关键词: quantum information;    single photon detection;    quantum gates;    conditional measurements;   

RP-ID  :  HPL-2004-135

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

We discuss a new and novel approach to the problem of creating a photon number resolving detector using the giant Kerr nonlinearities available in electromagnetically induced transparency. Our scheme can implement a photon number quantum non-demolition measurement with high efficiency (>99%) which can distinguish 0, 1 and 2 photons. We then show how it is possible to construct a near deterministic CNOT using several single photons sources, linear optics, photon number resolving quantum non-demolition detectors and feed-forward. Notes: Kae Nemoto, National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan; R. G. Beausoleil, HP Laboratories, 13837 175th Pl., NE, Redmond, WA 98052-2180, USA 4 Pages