US 12,422,732 B2
Two-photon quantum photonic logic gates
Jung-Tsung Shen, St. Louis, MO (US); Yao Zhou, St. Louis, MO (US); and Zihao Chen, St. Louis, MO (US)
Assigned to Washington University, St. Louis, MO (US)
Filed by Washington University, St. Louis, MO (US)
Filed on Dec. 23, 2021, as Appl. No. 17/561,556.
Claims priority of provisional application 63/130,112, filed on Dec. 23, 2020.
Prior Publication US 2022/0206361 A1, Jun. 30, 2022
Int. Cl. G02F 3/00 (2006.01); G06N 10/20 (2022.01)
CPC G02F 3/00 (2013.01) [G06N 10/20 (2022.01)] 17 Claims
OG exemplary drawing
 
1. A photonic controlled-phase gate comprising a dipole emitter chirally coupled to a plurality of photonic qubit pairs in a photonic crystal waveguide, each photonic qubit pair comprising a two-qubit state |xycustom character, wherein:
a. the two-qubit state |xycustom character comprises a combination of single-qubit states |0custom character and |1custom character, the state selected from the group consisting of |00custom character, |01custom character, |10custom character, and | 11);
b. the dipole emitter is configured to interact with the single-qubit state |0custom character to impose a π phase shift; and
c. the dipole emitter interacts with states |00custom character, |01custom character, and |10custom character to impose the π phase shift;
wherein the photonic crystal waveguide comprises a glide plane structure and the dipole emitter is positioned at a chiral point of the photonic crystal waveguide.