California Institute of Technology

Xponent Photonics Inc

Amazon Technologies, Inc.

University of Rochester

Other

Lucent Technologies Inc.

Stc.unm

Ionq, Inc.

Oskar Jon Painter

Kerry J Vahala

David W Vernooy

Andrew J Keller

Alp Sipahigil

Mahmoud Kalaee

Michael T Fang

Peter C Sercel

Jie Luo

Paul B Dieterle

Johannes M Fink

Gregory MacCabe

Hengjiang Ren

Justin D Cohen

Kyungjoo Noh

Guido Hunziker

Patricio Arrangoiz Arriola

Harald Esko Jakob Putterman

Axel Scherer

Christopher Chamberland

Fernando Brandao

Amir Safavi-Naeini

Mihir Keshav Bhaskar

Bartholomeus Johannes Machielse

David Sarkis Levonian

Qiang Lin

Joseph Kramer Iverson

Antia Lamas Linares

Amnon Yariv

Martin Winger

Connor Hann

Reginald Lee

Vinicius Thaddeu Dos Santos Ferreira

Yuanjian Xu

Eun Jong Kim

Andrew Joseph Keller

Alexander Grey Krause

Seyed Mohammad Mirhosseini Niri

Federico Capasso

Alfred Yi Cho

Deborah Lee Sivco

John O'Brien

Claire F Gmachl

Paul Bridger

Sanjay Krishna

William M Jones

Charles I Grosjean

Donald M Tennant

Arthur Mike Sergent

David S Alavi

Earl Campbell

Jonathan Lee

Ming Cai

Rassul Karabalin

Mariano Troccoli

Liang Jiang

Prasahnt Sivarajah

Raffaele Colombelli

Kartik A Srinivasan

Robert B Lee

Qian Xu

David John Perello

Gregory Peairs

Hesam Moradinejad

Nasser Alidoust

Matthew Sullivan Hunt

Gregory Scott Maccabe

Tim D Blasius

Arne Grimsmo

Ashley James Milsted

Colm Andrew Ryan

Matthew Matheny

Menyoung Lee

Thiago Alegre

Thomas Scaffidi

Timothy Dobson Blasius

Matthew Borselli

Thomas J Johnson

Kartik Srinivasan

John OBrien

A system and method for providing quantum entanglement as a service are described. Intermediate nodes which may be located in trusted or trustless locations are used to distribute quantum entanglement to endpoints, such as endpoints of customers of a quantum entanglement distribution service. The distributed quantum entanglement provides a secure communication path that does not rely on trust placed in an infrastructure or software provider. To distribute the quantum entanglement, intermediate nodes comprising quantum memories are used. Joint measurements are performed on quantum particles of respective entangled quantum pairs received at the intermediate nodes without collapsing superposition states of the particles. This allows for the quantum entanglement to be extended across intermediate nodes while maintaining entanglement and superposition of the entangled quantum particles.

Quantum entanglement distribution service

Systems and methods for implementing a quantum code using cat qubits as data qubits and transmon qubits as ancilla qubits is disclosed. In some embodiments, a three-level transmon is used and Chi-matching is performed to determine dispersive coupling coefficients between the cat qubits and first and second excited states of the transmon qubits, wherein the dispersive coupling coefficients are used to perform gates between the cat data qubits and the transmon ancilla qubits. The Chi-matching determines the dispersive coupling coefficients such that the cat qubits are rotated in a same manner while performing the gates regardless as to whether a given transmon ancilla qubit remains in a second excited state or has decayed to a first excited state.

Quantum codes implemented using cat data qubits and transmon ancilla qubits

A fabrication method and associated apparatus is disclosed where an electromechanical resonator made out of lithium niobate is fabricated on the same substrate as a Josephson Junction-based transmon qubit. The starting material may be a high resistivity silicon wafer with a thin layer of lithium niobate (LiNbO¬). The fabrication method may include removing lithium niobate selectively from the substrate to preserve the quality of the substrate. The selective removal maintains defect free qualities of the silicon surface, thus enabling the fabrication of high performance Josephson Junction-based transmon qubit on the surface.

Method for producing transmon qubit and lithium niobate resonator on the same substrate

High-fidelity measurements of qubits are achieved by increasing a number of measurements taken by use of a swap operation and a readout qubit, deflating a bosonic qubit for which measurement outcomes are affected by single photon/phonon loss events, deflating a bosonic qubit enabling readout in other basis, and evolving the qubit under a Hamiltonian that couples a mode to be measured to another mode where the Hamiltonian is selected from a three wave mixing interaction, and/or a combination of these techniques.

High-fidelity measurement of bosonic modes

Embodiments described herein include systems and techniques for converting (i.e., transducing) a quantum-level (e.g., single photon) signal between the three wave forms (i.e., optical, acoustic, and microwave). A suspended crystalline structure is used at the nanometer scale to accomplish the desired behavior of the system as described in detail herein. Transducers that use a common acoustic intermediary transform optical signals to acoustic signals and vice versa as well as microwave signals to acoustic signals and vice versa. Other embodiments described herein include systems and techniques for storing a qubit in phonon memory having an extended coherence time. A suspended crystalline structure with specific geometric design is used at the nanometer scale to accomplish the desired behavior of the system.

Techniques for bidirectional transduction of quantum level signals between optical and microwave frequencies using a common acoustic intermediary

Selective frequency dissipation is implemented that enables cooling of energy gap protected qubits such that excited energy states resulting from heating or other undesired processes are returned to a lower excited energy state or a ground state manifold, thus reducing the probability of errors. Also, the selective frequency dissipation inhibits leakage from the energy gap protected qubits when in the ground state.

Frequency selective photon dissipation for an energy gap protected qubit

A system and method for providing quantum entanglement using a hybrid space-fiber quantum network are described. The hybrid space-fiber quantum network includes a communications hub located proximate to an optical ground station and also includes an aerial entangled particle source, such as an entangled photon source attached to a satellite, drone, aircraft, etc. An atmospheric or free-space channel is used to distribute quantum entanglement between optical ground stations that are separated by geographic distances, via the aerial entangled particle source. Also, fiber optic links are connected to the communications hub located proximate to the optical ground station. The communications hub includes optical switches that enable any of the fiber optic links connected to the communications hub to receive or send distributed quantum entanglement to a remotely located recipient endpoint via the atmospheric or free-space channel.

Hybrid space-fiber quantum networks for widespread entanglement distribution

A shielded bridge for a coplanar waveguide (CPW) includes a signal bridge extending from a first terminal of the CPW to a second terminal of the CPW. The signal bridge has a raised central portion that extends over a separate signal conductor. The shielded bridge for the CPW also includes a ground bridge extending from a first ground plane on a first side of the separate signal conductor to a second ground plane on a second side of the separate signal conductor. The ground bridge is positioned between the signal bridge and the separate signal conductor.

Shielded bridges for quantum circuits

Techniques for transduction and storage of quantum level signals

A fault tolerant quantum computer is implemented using hybrid acoustic-electric qubits. A control circuit includes an asymmetrically threaded superconducting quantum interference devices (ATS) that excites excite phonons in a mechanical resonator by driving a storage mode of the mechanical resonator and dissipates phonons from the mechanical resonator via an open transmission line coupled to the control circuit, wherein the open transmission line is configured to absorb photons from a dump mode of the control circuit.

Fault-tolerant quantum hardware using hybrid acoustic-electrical qubits

Metamaterial waveguides and shielded bridges are employed to improve the scalability and routing of quantum computing circuits. A metamaterial waveguide includes a signal conductor that has a periodic array of lumped element resonators distributed along and electrically coupled to a signal conductor. The periodic array of lumped element resonator pairs defines a bandgap within an operating bandwidth of the waveguide. Qubits can communicate within the operating bandwidth of the waveguide and communications via the waveguide can be controlled by changing a center frequency of the qubits. A shielded bridge is used to cross over high frequency communications and control CPW's in a quantum computing circuit. The shielded bridge includes a signal bridge that is elevated and extends over a separate CPW, and a ground bridge positioned between the signal bridge and the separate CPW.

Metamaterial waveguides and shielded bridges for quantum circuits

Growing community of inventors

Sierra Madre, CA, United States of America

Oskar Jon Painter