US 12,326,665 B2
Quantum meta-device for ultrasensitive displacement metrology
Yubin Fan, Kowloon (HK); Mu Ku Chen, Kowloon (HK); and Din Ping Tsai, Kowloon (HK)
Assigned to City University of Hong Kong, Kowloon (HK)
Filed by City University of Hong Kong, Kowloon (HK)
Filed on Oct. 20, 2023, as Appl. No. 18/490,929.
Claims priority of application No. 202310648823.4 (CN), filed on Jun. 2, 2023.
Prior Publication US 2024/0402616 A1, Dec. 5, 2024
Int. Cl. G03F 7/00 (2006.01); G01J 1/16 (2006.01); G01J 1/44 (2006.01); G02F 1/35 (2006.01)
CPC G03F 7/70633 (2013.01) [G01J 1/1626 (2013.01); G02F 1/3526 (2013.01); G03F 7/706847 (2023.05); G03F 7/706849 (2023.05); G03F 7/706851 (2023.05); G01J 2001/442 (2013.01); G03F 7/706831 (2023.05)] 19 Claims
OG exemplary drawing
 
1. A displacement measurement system, comprising:
a) an entangled state light source generator adapted to emit a linearly-polarized photon pair; the linearly-polarized photon pair being an entangled photon pair;
b) a meta-device element adapted to receive the linearly-polarized photon pair and converts the same to a circularly-polarized photon pair;
c) a first polarization beam splitter adapted to split one or both ways of the circularly-polarized photon pair into a left-handed rotational photon and a right-handed rotational photon, and to output the left-handed rotational photon and the right-handed rotational photon via a first port and a second port of the first polarization beam splitter respectively; and
d) a computing section adapted to compute a correlated count reading between the first and second ports of the first polarization beam splitter, and to determine a displacement of the meta-device element.