Psiquantum Corp.

The University of Bristol

Nokia Technologies Oy

Bmc Software, Inc.

Mark G Thompson

Damien Bonneau

Faraz Najafi

Eric Dudley

Vimal Kumar Kamineni

Syrus Ziai

Koustuban Ravi

Yong Liang

Mihai Dorian Vidrighin

Joaquin Matres Abril

Chia-Ming Chang

Alessandro Farsi

George Kovall

Vitor Riseti Manfrinato

Chia-Jung Chung

Jeremy Lloyd O'Brien

Antti Niskanen

Gabriel J Mendoza

Steve Wong

Artemios Tavoularis

Thomas L Adrian

Sun Chun Chu

Cedric Young

Siyuan Yu

Philip Sibson

Terence Rudolph

Jek Wong

Mark Godfrey

Jonathan C F Matthews

Jonathan Matthews

Joshua Wimbridge Silverstone

Li Hongwei

Anthony Laing

Mirko Lobino

Xinlun Cai

A system includes a classical computing system and one or more quantum computing chips coupled to the classical computing system. The one or more quantum computing chips includes one or more electro-optic devices. Each electro-optic device includes a substrate, a waveguide disposed on top of the substrate, and a layer stack disposed on top of the waveguide and including a plurality of electro-optic material layers interleaved with a plurality of interlayers. Each electro-optic device further comprising a waveguide core disposed on top of a portion of the layer stack. The plurality of interlayers are characterized by a first lattice structure and the plurality of electro-optic material layers are under tensile stress and are characterized by a second lattice structure and crystallographic phase.

Engineered electro-optic devices

Techniques disclosed herein relate to photon sources with high spectral purity and high brightness. In one embodiment, a photon-pair source includes a pump waveguide, a first resonator coupled to the pump waveguide to couple pump photons from the pump waveguide into the first resonator, a second resonator coupled to the first resonator, and an output waveguide coupled to the second resonator. The second resonator is configured to convert the pump photons into photon pairs. The second resonator and the first resonator are configured to cause a coupling-induced resonance splitting in the second resonator or the first resonator. The second resonator and the output waveguide are configured to couple the photon pairs from the second resonator into the output waveguide. In some embodiments, the photo-pair source includes one or more tuners for tuning at least one of the first resonator or the second resonator.

Coupled resonator photon-pair sources

An electro-optic device includes a substrate and a waveguide on the substrate. The waveguide includes a layer stack including a plurality of electro-optic material layers interleaved with a plurality of interlayers and a waveguide core adjacent to the layer stack. The waveguide may include a pair of electrodes in electrical contact with the plurality of electro-optic material layers. The plurality of interlayers maintains a first lattice structure at room temperature and a cryogenic temperature. The plurality of electro-optic material layers maintains a second lattice structure and crystallographic phase at the room temperature and the cryogenic temperature.

A photonic switch includes a first waveguide including a first region extending between a first coupler section and a second coupler section and a second region extending between the second coupler section and a third coupler section. The photonic switch also includes a second waveguide including a first portion extending between the first coupler section and the second coupler section, the first portion including at least two first compensation sections each having a different waveguide width, and a second portion extending between the second coupler section and the third coupler section, the second portion including at least two second compensation sections each having a different waveguide width. The photonic switch further includes at least one variable phase-shifter disposed in at least one of the first waveguide or the second waveguide.

Interferometer filters with compensation structure

An optical device includes a first multi-mode waveguide, a first optical coupler coupled to the first multi-mode waveguide, the first coupler being tapered and curved, and a first single-mode waveguide having a first end coupled to the first optical coupler. The optical device maybe used in an optical delay device. A method of propagating light in a first multi-mode waveguide toward a first optical coupler, propagating the light in the first optical coupler toward a first single-mode waveguide, the first optical coupler being tapered and curved, and propagating the light along the first single-mode waveguide is also disclosed.

Multi-mode spiral delay device

An optical coupler includes a first waveguide including a first multi-mode waveguide section having a cross-section characterized by a first height and a first width that is greater than the first height and a second waveguide including a second multi-mode waveguide section having a cross-section characterized by a second height and a second width that is greater than the second height. The first multi-mode waveguide section is positioned adjacent to the second multi-mode waveguide section at least partially above or below the second multi-mode waveguide so that light entering the first multi-mode waveguide section is coupled from the first multi-mode waveguide section to the second multi-mode waveguide section. Methods for coupling light between waveguides with the optical coupler and optical devices that include the optical coupler are also described.

Waveguide couplers for multi-mode waveguides

A device includes a first semiconductor layer; a portion of a second semiconductor layer disposed on the first semiconductor layer; and a third semiconductor layer including a first region disposed on the portion of the second semiconductor layer and a second region disposed on the first semiconductor layer. A thickness of the first region is less than a predefined thickness. The device also includes an etch stop layer disposed on the third semiconductor layer; a plurality of distinct portions of a fourth semiconductor layer disposed on the etch stop layer and exposing one or more distinct portions of the etch stop layer over the portion of the second semiconductor layer; and a plurality of distinct portions of a superconducting layer disposed on the plurality of distinct portions of the fourth semiconductor layer and the exposed one or more distinct portions of the etch stop layer.

Complementary metal-oxide semiconductor compatible patterning of superconducting nanowire single-photon detectors

An optical delay device includes a multi-mode waveguide for propagating first light through at least a portion of the multi-mode waveguide. The multi-mode waveguide has a first width. The optical delay device also includes a first waveguide having a second width that is less than the first width and a first coupler connected to the multi-mode waveguide and the first waveguide for coupling the first light from the multi-mode waveguide to the first waveguide. The first waveguide includes a first portion connected to the first coupler for receiving the first light from the first coupler; and a second portion connected to the first portion for receiving the first light from the first portion and positioned adjacent to the multi-mode waveguide for coupling of the first light to the multi-mode waveguide as second light so that the second light propagates through at least the portion of the multi-mode waveguide.

Multi-mode multi-pass delay

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.

Photon number resolving superconducting detector

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.

A system includes a plurality of wafer-scale modules and a plurality of optical fibers. Each wafer-scale module includes an optical backplane and one or more die stacks on the optical backplane. The optical backplane includes a substrate and at least one optical waveguide layer configured to transport and/or manipulate photonic quantum systems (e.g., photons, qubits, qudits, large entangled states, etc.). Each die stack of the one or more die stacks includes a photonic integrated circuit (PIC) die optically coupled to the at least one optical waveguide layer of the optical backplane. The plurality of optical fibers is coupled to the optical backplanes of the plurality of wafer-scale modules to provide inter-module and/or intra-module interconnects for the photonic quantum systems.

Multi-chip photonic quantum computer assembly with optical backplane interposer

Described is a method for work assignment queue elimination. The method includes maintaining at least one data structure including an ordered list of ticket assignment rules and assignment result metrics, receiving a ticket indicating a system problem, assigning the ticket based on the ordered list of ticket assignment rules, the system problem and the assignment result metrics, collecting metrics based on the ticket assignment, and revising the assignment result metrics based on the collected metrics.

Work assignment queue elimination

The various embodiments described herein include methods, devices, and systems for fabricating and operating superconducting photon detectors. In one aspect, a photon detector includes: (1) a first waveguide configured to guide photons from a photon source; (2) a second waveguide that is distinct and separate from the first waveguide and optically-coupled to the first waveguide; and (3) a superconducting component positioned adjacent to the second waveguide and configured to detect photons within the second waveguide.

Superconducting photon detector

A superconductor device is manufactured by depositing a barrier layer over a substrate including silicon, the barrier layer including silicon and nitrogen; depositing a seed layer for a superconductor layer over the barrier layer, the seed layer including aluminum and nitrogen; depositing the superconductor layer over the seed layer, the superconductor layer including a layer of a superconductor material, the barrier layer serving as an oxidation barrier between the layer superconductor material and the substrate; and depositing a silicon cap layer over the superconductor layer. In some embodiments, the superconductor device includes a waveguide and a metal contact at a sufficient distance from the waveguide to prevent optical coupling between the metal contact and the waveguide.

Growing community of inventors

San Jose, CA, United States of America

Mark G Thompson