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| Number | Title | Issue Date |
| 8073336 | Entanglement-based QKD system with active phase tracking Entanglement-based QKD systems and methods with active phase tracking and stabilization are disclosed wherein pairs of coherent photons at a first wavelength are generated. Second harmonic generation and spontaneous parametric downconversion are used to generate fro... | 12/06/2011 |
| 7606371 | Two-way QKD system with active compensation A two-way actively stabilized QKD system that utilizes control signals and quantum signals is disclosed. Because the quantum signals do not traverse the same optical path through the system, signal collisions in the phase modulator are avoided. This allows the syste... | 10/20/2009 |
| 7583803 | QKD stations with fast optical switches and QKD systems using same 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... | 09/01/2009 |
| 7570365 | Compact tunable high-efficiency entangled photon source 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 ... | 08/04/2009 |
| 7502476 | Systems and methods of enhancing QKD security using a heralded photon source 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... | 03/10/2009 |
| 7437081 | System and method for providing two-way communication of quantum signals, timing signals, and public data 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 ... | 10/14/2008 |
| 7409162 | Timing error reduction in QKD systems Systems and methods for reducing or eliminating timing errors in a quantum key distribution (QKD) system (100) are disclosed. The QKD system has a pulse generator with retimer (PGRT) that includes a field-programmable gate array (FPGA) (or FPGA output) which ... | 08/05/2008 |
| 7359514 | Narrow-band single-photon source and QKD system using same 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. ... | 04/15/2008 |
| 7284024 | Quantum noise random number generator 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 whic... | 10/16/2007 |
| 7254295 | Optical fiber interferometer with relaxed loop tolerance and QKD system using the same An optical fiber interferometer (10) with relaxed loop tolerance, and a quantum key distribution (QKD) system (200) using same is disclosed. The interferometer includes two optical fiber loops (LP1 and LP2). The loops have an optical path... | 08/07/2007 |
| 7242775 | Optical pulse calibration for quantum key distribution 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. Th... | 07/10/2007 |
| 7233672 | Constant modulation for enhancing QKD security 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 me... | 06/19/2007 |
| 7227955 | Single-photon watch dog detector for folded quantum key distribution system 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... | 06/05/2007 |
| 7181011 | Key bank systems and methods for QKD 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 Ali... | 02/20/2007 |
