Method and apparatus for quantum communication

摘要

A quantum state or qubit is transmitted from a sender (10) to receiver (12) using a quantum teleportation. For this purpose, first, second and third photons (Ä1Ü, Ä2Ü and Ä3Ü) are successively produced from a laser source (22). The first photon is modified in polarization (x1, y1) according to encoded information to be sent. The second and third photons are mutually quantum-mechanically correlated and shared by the sender and receiver, respectively. The sender measures the polarized states (x1, y1; x2, y2) of the coincidentally appearing first and second photons and transmits measurement outcomes to the receiver via classical communication. The receiver recovers information of the first photon (Ä1Ü) from the third photon (Ä3Ü) based on his measurement and the measurement outcomes transmitted by the sender.