Recent Progress in Quantum Optics. Quantum Cryptography and Measurement of Quantum States
最近の量子光学の進展 量子暗号と量子状態の測定

2000 The Review of Laser Engineering  
The basic concept of quantum key distribution is reviewed. The security of quantum key distribution and nocloning (and related) theorems in the cases for various states are discussed. It is shown thatmany of the problems are related to what one can do and what one cannot do, under the restriction of not modifying the marginal density operator of a system. The security under the realistic situations is also briefly reviewed.
doi:10.2184/lsj.28.677 fatcat:3cagfoo3c5guhgtvspy6qq2na4