US 12,244,339 B2
Transmitter for a quantum communication system, a receiver for a quantum communication system and a method of controlling a quantum communication system
Robert Ian Woodward, Cambridge (GB); Yuen San Lo, Cambridge (GB); and Andrew James Shields, Cambridge (GB)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed on Jan. 31, 2023, as Appl. No. 18/162,013.
Claims priority of application No. 2203155 (GB), filed on Mar. 7, 2022.
Prior Publication US 2023/0283370 A1, Sep. 7, 2023
Int. Cl. H04B 10/079 (2013.01); H04B 10/50 (2013.01); H04B 10/60 (2013.01); H04L 9/08 (2006.01)
CPC H04B 10/07953 (2013.01) [H04B 10/50 (2013.01); H04B 10/60 (2013.01); H04L 9/0852 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A quantum communication system comprising:
a transmitter comprising transmitter components, the transmitter components comprising a source of pulsed radiation and a modulation unit, the modulation unit being configured to randomly encode pulses of radiation;
a receiver comprising receiver components, the receiver components comprising a demodulator and detector configured to decode and detect said randomly encoded pulses; and
a control unit and an optimisation unit, the control unit being configured to apply a plurality of control signals defined by a set of control parameters to at least one of said transmitter components and receiver components, the optimisation unit being configured to tune the set of control parameters,
wherein the optimisation unit sets the control parameters by:
obtaining a score indicating a quality of the system corresponding to a first set of control parameters, and
estimating a further set of control parameters suitable via an iterative process to obtain a tuned set of control parameters.