Patent ID: 6314189
Filing Date: 2001-11-06
Classification: H04B,Y10S

Abstract:
A method for quantum communication adapted for use in transmitting a quantum state or qubit from a sender to a receiver, comprising the steps of:preparing a first particle having a quantum state corresponding to encoded information to be sent, and preparing mutually correlated second and third particles having a quantum-mechanical entanglement, the first and second particles being observed by the sender, and the third particle being observed by the receiver;generating a mixture with a predetermined mixing ratio consisting of products of a first quantum state derived from the first particle and an orthogonal state thereof and a second quantum state derived from a composite system of the second and third particles, the mixture being shared by the sender and receiver;transmitting outcomes of measurement made by the sender for a composite system including the first and second particles to the receiver via classical communication; andmeasuring the third particle on the receiver's side to decode the transmitted information encoded on the first particle whose quantum state is recovered on the third particle based on the measurement outcomes transmitted by the sender.