Non-repudiation transmission of megabit images over 100 kilometers (IMAGE)
Caption
(a) Bob (Charlie) exploits a master laser, an asymmetric interferometer, two slave lasers, two circulators (Circ), and a beam splitter (BS) to prepare optical pulses in the Z and X bases by controlling the trigger electrical signal of slave lasers. The decoy signals are generated by the amplitude modulator (AM), whereas the vacuum state is produced by removing the triggered signal of slave lasers. The optical pulses pass through a set of fiber Bragg grating (FBG), circulator, and attenuator (Att) to be modulated at the single-photon level. The synchronization (Syn) signal is transmitted to quantum channels with a dense wavelength division multiplexer (DWDM). The synchronization pulse is detected by an avalanche photodiode (APD). A biased beam splitter is utilized to realize a passive basis measurement with a single-photon detector (SPD). An asymmetric interferometer is formed by two Faraday mirrors (FM), a phase shifter (PS), and a beam splitter. The quantum signals sent by Bob (Charlie) are received by Alice by time-division multiplexing (TDM). (b) Experimental results of the decoy-state quantum key distribution. The blue and red curves of the secret key rate correspond to the simulation results using experimental parameters. (c) Demonstration of quantum digital signatures. The document to be signed with a length of 130,250 bytes includes the timestamp, identity number of the desert image, and the image itself.
Credit
©Science China Press
Usage Restrictions
Use with credit.
License
Original content