1
Harry N Vig, Alexei Trifonov: Optical pulse calibration for quantum key distribution. MagiQ Technologies, Opticus IP Law PLLC, July 10, 2007: US07242775 (13 worldwide citation)

Methods and systems for generating calibrated optical pulses in a QKD system. The method includes calibrating a variable optical attenuator (VOA) by first passing radiation pulses of a given intensity and pulse width through the VOA for a variety of VOA settings. The method further includes resettin ...


2
Alexei Trifonov, Harry Vig: Quantum noise random number generator. MagiQ Technologies, Opticus IP Law PLLC, October 16, 2007: US07284024 (12 worldwide citation)

A quantum noise random number generator system that employs quantum noise from an optical homodyne detection apparatus is disclosed. The system utilizes the quantum noise generated by splitting a laser light signal using a beamsplitter having four ports, one of which receives one of which is receive ...


3
Alexei Trifonov, Harry Vig: Single-photon watch dog detector for folded quantum key distribution system. Magiq Technologies, Opticus IP Law PLLC, June 5, 2007: US07227955 (12 worldwide citation)

A single-photon “watch dog” detector for a two-way quantum key distribution (QKD) system. The detector can detect weak probe signals associated with a Trojan horse attack, or weak substitute signals associated with a “man in the middle” attacks. The detector provides for a significant increase in se ...


4
Alexei Trifonov, Anton Zavriyev: Compact tunable high-efficiency entangled photon source. MagiQ Technologies, Opticus IP Law PLLC, August 4, 2009: US07570365 (12 worldwide citation)

A compact, tunable, high-efficiency entangled photon source system that utilizes first and second periodically poled waveguides rather than bulk media in order to decrease the required pump power by up to several orders of magnitude. The first and second waveguides are arranged in respective arms of ...


5
Alexei Trifonov, Anton Zavriyev: Narrow-band single-photon source and QKD system using same. MagiQ Technologies, Opticus IP Law PLLC, April 15, 2008: US07359514 (7 worldwide citation)

A narrow-band single-photon source (10) is disclosed, along with a QKD system (200) using same. The single-photon source is based on spontaneous parametric downconversion that generates signal and idler photons (PS and PI) as an entangled photon pair. Narrow-band signal photons are generated by sele ...


6
Alexei Trifonov: QKD stations with fast optical switches and QKD systems using same. MagiQ Technologies, Opticus IP Law PLLC, September 1, 2009: US07583803 (6 worldwide citation)

The quantum key distribution (QKD) systems (200, 300, 400) of the invention includes first and second QKD stations (Alice and Bob) according to the present invention, wherein either one or both QKD stations include fast optical switches (120, 220, 310, 320). Each fast optical switch is respectively ...


7
J Howell Mitchell, Harry Vig, Jonathan Young, Alexei Trifonov: Constant modulation for enhancing QKD security. MagiQ Technologies, Opticus IP Law PLLC, June 19, 2007: US07233672 (6 worldwide citation)

A method of improving the security of a QKD system is disclosed. The QKD system exchanges qubits between QKD stations, wherein the brief period of time surrounding the expected arrival time of a qubit at a modulator in a QKD station defines a gating interval. The method includes randomly activating ...


8
J Howell Mitchell, Harry N Vig, Anton Zavriyev, Alexei Trifonov: System and method for providing two-way communication of quantum signals, timing signals, and public data. Magiq Technologies, Opticus IP Law PLLC, Peter A Nieves, Joseph E Gortych, October 14, 2008: US07437081 (5 worldwide citation)

A system and method for providing two-way communication of quantum signals, timing signals, and public data is provided. Generally, the system contains a first public data transceiver capable of transmitting and receiving public data in accordance with a predefined timing sequence, a first optical m ...


9
Alexei Trifonov: Key bank systems and methods for QKD. MagiQ Technologies, Opticus IP Law PLLC, February 20, 2007: US07181011 (5 worldwide citation)

Key banking methods and systems for quantum key distribution (QKD) are disclosed. A method of the invention includes establishing a primary key bank that stores perfectly secure keys associated with exchanging true quantum pulses between two QKD stations Bob and Alice. The method also Includes estab ...


10
Alexei Trifonov, Ekaterina Rogacheva: Systems and methods of enhancing QKD security using a heralded photon source. MagiQ Technologies, Opticus IP Law PLLC, March 10, 2009: US07502476 (4 worldwide citation)

Systems and method of enhancing the security of a QKD system having operably coupled QKD stations (Alice, Bob) using correlated photon pulses (P1, P2) are disclosed. The method includes generating the correlated photon pulses at Alice and detecting one of the pulses (P2) to determine the number of p ...