US 12,470,305 B2
Quantum repeater for optical network and method
Akihisa Goban, Tokyo (JP); Shinya Kato, Tokyo (JP); Ryotaro Inoue, Tokyo (JP); and Takao Aoki, Tokyo (JP)
Assigned to Nanofiber Quantum Technologies, Inc., Tokyo (JP)
Filed by Nanofiber Quantum Technologies, Inc., Tokyo (JP)
Filed on Jul. 7, 2023, as Appl. No. 18/348,603.
Prior Publication US 2025/0015901 A1, Jan. 9, 2025
Int. Cl. H04B 10/70 (2013.01); G02B 6/02 (2006.01); H04B 10/079 (2013.01); H04B 10/291 (2013.01)
CPC H04B 10/70 (2013.01) [G02B 6/0208 (2013.01); H04B 10/298 (2020.05); H04B 10/0795 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A quantum repeater system including a plurality of repeater devices, including an initial repeater device and a final repeater device, the system comprising:
one or more intermediary repeater devices numbered from 1 to N, where N is an integer greater than or equal to 1 coupled between the initial repeater device and the final repeater device,
each of the intermediary repeater devices comprising:
a first fiber optical cable having a first end region and a second end region, the first end region having a first end, and the second end region having a second end;
a first fiber Bragg Grating configured on the first end region;
a second fiber Bragg Grating configured on the second end region;
a nanofiber region configured from a center portion of the fiber optic cable and coupled between the first end region and the second end region;
a first taper region configured from a first portion of the nanofiber region of the first fiber Bragg Grating and a second taper region configured from a second portion of the nanofiber region of the second fiber Bragg Grating;
a cavity formed from the nanofiber and tapered regions between the first fiber Bragg Grating and the second fiber Bragg Gratings;
a plurality of atoms selected from at least one of a cesium, a rubidium, an ytterbium, a strontium or other laser coolable atoms such that a number of the atoms range from one to 100,000 and are evanescently coupled to at least the nanofiber region between the first fiber Bragg grating and the second fiber Bragg grating;
an optical system comprising an imaging system, coupled to an trapping tweezer array and an controlling tweezer array to trap and manipulate two or more of the plurality of atoms; and
a plurality of optical cable, where one of the plurality of optical cables is coupled to at least one of the intermediary repeater devices, the initial repeater device, and the final repeater device in a serial connection to transmit one or more photons from the initial repeater device to one of the intermediary repeater device and then to the final repeater device to distribute a quantum entanglement that has been generated between at least a pair of adjacent repeaters that connected in a direct communication.