Invention Grant
- Patent Title: Hyper-entangled photon server system and associated methods
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Application No.: US15895545Application Date: 2018-02-13
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Publication No.: US10439737B2Publication Date: 2019-10-08
- Inventor: David H. Hughes , Reinhard K. Erdmann
- Applicant: GOVERNMENT OF THE UNITED STATES AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE
- Applicant Address: US DC Washington
- Assignee: The United States of America as represented by the Secretary of the Air Force
- Current Assignee: The United States of America as represented by the Secretary of the Air Force
- Current Assignee Address: US DC Washington
- Agent Joseph A. Mancini
- Main IPC: H04B10/85
- IPC: H04B10/85 ; H04L9/06 ; G02B27/14 ; G01J4/02 ; G02B27/28 ; H04B10/70 ; G06N10/00 ; G09C1/00 ; H04L9/08

Abstract:
A hyper-entanglement photon server (i.e., hub) employs non-degenerate frequencies input as entangled photon pairs into a beam splitter. The beam splitter splits probability amplitudes into two sets of bunched superposition states plus two sets of anti-bunched superposition states. The amplitudes pass through identical Lyot filters and then either enter a polarization beam splitter, where the bunched and anti-bunched states switch identities, or merely advance unchanged to awaiting users at two distinct and spatially-displaced positions (i.e., spokes). The Lyot filters change the output amplitudes from rotationally invariant superpositions of generalized Bell States to rotationally non-invariant superpositions of generalized Bell states. All hubs and spokes pre-share operating key material (a security method called KCQ) that may be continually updated by shared stream ciphers seeded by fresh key material engendered by hub-to-spoke quantum communication.
Public/Granted literature
- US20180241480A1 Hyper-Entangled Photon Server System and Associated Methods Public/Granted day:2018-08-23
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