公开(公告)号：US20220214214A1

公开(公告)日：2022-07-07

申请号：US17705204

申请日：2022-03-25

Applicant: PsiQuantum Corp.

Inventor： Faraz Najafi ,  Eric Dudley ,  Mark Thompson

IPC: G01J1/44 ,  G01J1/04

Abstract: A method of resolving a number of photons received by a photon detector includes optically coupling a waveguide to a superconducting wire having alternating narrow and wide portions; electrically coupling the superconducting wire to a current source; and electrically coupling an electrical contact in parallel with the superconducting wire. The electrical contact has a resistance less than a resistance of the superconducting wire while at least one narrow portion of the superconducting wire is in a non-superconducting state. The method includes providing to the superconducting wire, from the current source, a current configured to maintain the superconducting wire in a superconducting state in the absence of incident photons; receiving one or more photons via the waveguide; measuring an electrical property of the superconducting wire, proportional to a number of photons incident on the superconducting wire; and determining the number of received photons based on the electrical property.

公开(公告)号：US11313719B2

公开(公告)日：2022-04-26

申请号：US16623503

申请日：2019-04-30

Applicant: PSIQUANTUM CORP.

Inventor： Faraz Najafi ,  Eric Dudley ,  Mark Thompson

IPC: G01J1/44 ,  G01J1/04

Abstract: A photon detector is provided. The photon detector includes a superconducting wire having a plurality of alternating narrow and wide portions; a current source electrically-coupled to the superconducting wire and configured to supply the superconducting wire with electrical current; and an optical waveguide optically coupled to the plurality of narrow portions of the superconducting wire.

公开(公告)号：US20200371287A1

公开(公告)日：2020-11-26

申请号：US16599526

申请日：2019-10-11

Applicant: Psiquantum, Corp.

Inventor： Koustuban Ravi ,  Mark Thompson ,  Eric Dudley

IPC: G02B6/12 ,  G02B6/122 ,  G02B6/13

Abstract: A Mach-Zehnder interferometer (MZI) filter comprising one or more passive compensation structures are described. The passive compensation structures yield MZI filters that are intrinsically tolerant to perturbations in waveguide dimensions and/or other ambient conditions. The use of n+1 waveguide widths can mitigate n different sources of perturbation to the filter. The use of at least three different waveguide widths for each Mach-Zehnder waveguide can alleviate sensitivity of filter performance to random width or temperature variations. A tolerance compensation portion is positioned between a first coupler section and a second coupler section, wherein the tolerance compensation portion includes a first compensation section having a second width, a second compensation section having a third width and a third compensation section having a fourth width, wherein the fourth width is greater than the third width and the third width is greater than the second width.