Patents by Inventor Ish DHAND
Ish DHAND has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11989620Abstract: A method includes calculating a plurality of permutation matrices of an input matrix that characterizes a linear transformation of a plurality of input states. The method also includes determining a plurality of settings of an optical circuit based on the plurality of permutation matrices. Each setting in the plurality of settings is associated with an electric power, from a plurality of electric powers, consumed by the optical circuit. The method also includes determining a selected setting of the optical circuit based on the electric power from the plurality of electric powers and consumed by the optical circuit at each setting from the plurality of settings associated with the electric power. The method further includes implementing the selected setting on the optical circuit to perform the linear transformation of the plurality of input states.Type: GrantFiled: September 28, 2020Date of Patent: May 21, 2024Assignee: Xanadu Quantum Technologies Inc.Inventors: Ish Dhand, Haoyu Qi, Leonhard Neuhaus, Lukas Helt, Kamil Bradler, Zachary Vernon, Shreya Prasanna Kumar
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Publication number: 20230281499Abstract: A system for scalable, fault-tolerant photonic quantum computing includes multiple optical circuits, multiple photon number resolving detectors (PNRs), a multiplexer, and an integrated circuit (IC). During operation, the optical circuits generate output states via Gaussian Boson sampling (GBS), and the PNRs generate qubit clusters based on the output states. The multiplexer multiplexes the qubit clusters and replaces empty modes with squeezed vacuum states, to generate multiple hybrid resource states. The IC stitches together the hybrid resource states into a higher-dimensional cluster state that includes states for fault-tolerant quantum computation.Type: ApplicationFiled: March 27, 2023Publication date: September 7, 2023Applicant: Xanadu Quantum Technologies Inc.Inventors: Joseph Eli BOURASSA, Ilan TZITRIN, Krishnakumar SABAPATHY, Guillaume DAUPHINAIS, Ish DHAND, Saikat GUHA, Nicolas MENICUCCI, Rafael ALEXANDER, Ben BARAGIOLA, Takaya MATSUURA, Blayney WALSHE
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Patent number: 11747132Abstract: A method includes receiving a representation of an N-mode interferometer and a representation of at least one imperfection associated with the N-mode interferometer at a processor, N being a positive integer value. The processor identifies multiple two-mode interferometers and multiple phases based on the representation of the N-mode interferometer and the representation of the at least one imperfection. The multiple two-mode interferometers and the multiple phases are configured to apply a unitary transformation to an input signal. The method also includes sending a signal to cause at least one of storage or display of a representation of the multiple two-mode interferometers and a representation of the multiple phases.Type: GrantFiled: December 17, 2021Date of Patent: September 5, 2023Assignee: Xanadu Quantum Technologies Inc.Inventors: Ish Dhand, Shreya Prasanna Kumar, Dylan Mahler, Blair Morrison, Lukas Helt, Leonhard Neuhaus
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Publication number: 20230169382Abstract: A method for simulating a bosonic quantum bit (qubit) on a classical computer are described. The method determines a phase space representation of the qubit in the form of a linear combination of Gaussian functions, each of which is characterized by a mean, a covariance matrix, and a weight coefficient determined from user defined energy parameter and qubit class of the qubit. The qubit may be simulated on a classical computer by applying transformations of quantum logic gates and measurements to update the weight coefficient, mean, and covariance matrix of each of the Gaussian functions.Type: ApplicationFiled: August 17, 2022Publication date: June 1, 2023Inventors: Joseph Eli BOURASSA, Nicolas QUESADA, Ilan TZITRIN, Krishnakumar SABAPATHY, Guillaume DAUPHINAIS, Ish DHAND
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Publication number: 20230042396Abstract: A method includes causing activation, at a first time, of a first set of squeezed light sources from a plurality of squeezed light sources of a Gaussian boson sampling (GBS) circuit. At a second time after the first time, a first photon statistic is detected at a first output port from a plurality of output ports of the GBS circuit. At a third time after the first time, a second set of squeezed light sources from the plurality of squeezed light sources of the GBS circuit is activated, the second set of squeezed light sources being different from the first set of squeezed light sources. At a fourth time after the third time, a second photon statistic is detected at a second output port from the plurality of output ports of the GBS circuit. At least one transformation matrix is estimated that represents a linear optical interferometer of the GBS circuit based on the first photon statistic and the second photon statistic.Type: ApplicationFiled: June 21, 2022Publication date: February 9, 2023Applicant: Xanadu Quantum Technologies Inc.Inventors: Ish DHAND, Shreya PRASANNA KUMAR
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Patent number: 11543668Abstract: A method includes configuring a first plurality of beamsplitters in a network of interconnected beamsplitters of an optical circuit into a transmissive state. The optical circuit is configured to perform a linear transformation of N input optical modes, where N is a positive integer. The first plurality of beamsplitters is located along a beam path within the optical circuit and traversing a target location. The method also includes configuring a second plurality of beamsplitters in the network of interconnected beamsplitters of the optical circuit into a reflective state to reconfigure the optical circuit into a reconfigured optical circuit. The reconfigured optical circuit is configured to perform a linear transformation on M input optical modes, where M is a positive integer less than N. The second plurality of beamsplitters is located along at least one edge of the optical circuit.Type: GrantFiled: September 25, 2020Date of Patent: January 3, 2023Assignee: Xanadu Quantum Technologies Inc.Inventors: Kamil Bradler, Ish Dhand
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Publication number: 20220391571Abstract: A method includes receiving a representation of a quantum circuit at a processor and identifying multiple contraction trees based on the representation of the quantum circuit. Each of the contraction trees represents a tensor network from a set of tensor networks. A first subset of multiple tasks, from a set of tasks associated with the plurality of contraction trees, is assigned to a first set of at least one compute device having a first type. A second subset of multiple tasks mutually exclusive of the first subset of multiple tasks is assigned to a second set of at least one compute device having a second type different from the first type. The quantum circuit is simulated by executing the first subset of tasks via the first set of at least one compute device and executing the second subset of tasks via the second set of at least one compute device.Type: ApplicationFiled: May 31, 2022Publication date: December 8, 2022Inventors: Ish DHAND, Trevor VINCENT, Haoyu QI
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Patent number: 11454862Abstract: An apparatus includes a plurality of interconnected reconfigurable beam splitters and a plurality of phase shifters collectively configured to define a network of optical devices. The network of optical devices is configured to perform a universal transformation on a plurality of input optical signals via a triangular architecture. The apparatus also includes a first delay line optically coupled to the network of optical devices and configured to send at least one output optical signal from a plurality of output optical signals of the network of optical devices to interact with at least one input optical signal in the plurality of input optical signals within the network of optical devices.Type: GrantFiled: December 18, 2019Date of Patent: September 27, 2022Assignee: Xanadu Quantum Technologies Inc.Inventors: Kamil Bradler, Daiqin Su, Zachary Vernon, Lukas Helt, Ish Dhand
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Publication number: 20220196382Abstract: A method includes receiving a representation of an N-mode interferometer and a representation of at least one imperfection associated with the N-mode interferometer at a processor, N being a positive integer value. The processor identifies multiple two-mode interferometers and multiple phases based on the representation of the N-mode interferometer and the representation of the at least one imperfection. The multiple two-mode interferometers and the multiple phases are configured to apply a unitary transformation to an input signal. The method also includes sending a signal to cause at least one of storage or display of a representation of the multiple two-mode interferometers and a representation of the multiple phases.Type: ApplicationFiled: December 17, 2021Publication date: June 23, 2022Applicant: Xanadu Quantum Technologies Inc.Inventors: Ish DHAND, Shreya PRASANNA KUMAR, Dylan MAHLER, Blair MORRISON, Lukas HELT, Leonhard NEUHAUS
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Patent number: 11341428Abstract: A system for scalable, fault-tolerant photonic quantum computing includes multiple optical circuits, multiple photon number resolving detectors (PNRs), a multiplexer, and an integrated circuit (IC). During operation, the optical circuits generate output states via Gaussian Boson sampling (GBS), and the PNRs generate qubit clusters based on the output states. The multiplexer multiplexes the qubit clusters and replaces empty modes with squeezed vacuum states, to generate multiple hybrid resource states. The IC stitches together the hybrid resource states into a higher-dimensional cluster state that includes states for fault-tolerant quantum computation.Type: GrantFiled: September 29, 2021Date of Patent: May 24, 2022Assignee: Xanadu Quantum Technologies Inc.Inventors: Joseph Eli Bourassa, Ilan Tzitrin, Krishnakumar Sabapathy, Guillaume Dauphinais, Ish Dhand, Saikat Guha, Nicolas Menicucci, Rafael Alexander, Ben Baragiola, Takaya Matsuura, Blayney Walshe
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Publication number: 20220101168Abstract: A system for scalable, fault-tolerant photonic quantum computing includes multiple optical circuits, multiple photon number resolving detectors (PNRs), a multiplexer, and an integrated circuit (IC). During operation, the optical circuits generate output states via Gaussian Boson sampling (GBS), and the PNRs generate qubit clusters based on the output states. The multiplexer multiplexes the qubit clusters and replaces empty modes with squeezed vacuum states, to generate multiple hybrid resource states. The IC stitches together the hybrid resource states into a higher-dimensional cluster state that includes states for fault-tolerant quantum computation.Type: ApplicationFiled: September 29, 2021Publication date: March 31, 2022Applicant: Xanadu Quantum Technologies Inc.Inventors: Eli Bourassa, Ilan Tzitrin, Krishnakumar Sabapathy, Guillaume Dauphinais, Ish Dhand, Saikat Guha, Nicolas Menicucci, Rafael Alexander, Ben Baragiola, Takaya Matsuura, Blayney Walshe
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Publication number: 20210191232Abstract: An apparatus includes a plurality of interconnected reconfigurable beam splitters and a plurality of phase shifters collectively configured to define a network of optical devices. The network of optical devices is configured to perform a universal transformation on a plurality of input optical signals via a triangular architecture. The apparatus also includes a first delay line optically coupled to the network of optical devices and configured to send at least one output optical signal from a plurality of output optical signals of the network of optical devices to interact with at least one input optical signal in the plurality of input optical signals within the network of optical devices.Type: ApplicationFiled: December 18, 2019Publication date: June 24, 2021Inventors: Kamil BRADLER, Daiqin SU, Zachary VERNON, Lukas HELT, Ish DHAND
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Publication number: 20210097421Abstract: A method includes calculating a plurality of permutation matrices of an input matrix that characterizes a linear transformation of a plurality of input states. The method also includes determining a plurality of settings of an optical circuit based on the plurality of permutation matrices. Each setting in the plurality of settings is associated with an electric power, from a plurality of electric powers, consumed by the optical circuit. The method also includes determining a selected setting of the optical circuit based on the electric power from the plurality of electric powers and consumed by the optical circuit at each setting from the plurality of settings associated with the electric power. The method further includes implementing the selected setting on the optical circuit to perform the linear transformation of the plurality of input states.Type: ApplicationFiled: September 28, 2020Publication date: April 1, 2021Inventors: Ish DHAND, Haoyu QI, Leonhard NEUHAUS, Lukas HELT, Kamil BRADLER, Zachary VERNON, Shreya PRASANNA KUMAR
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Publication number: 20210096384Abstract: A method includes configuring a first plurality of beamsplitters in a network of interconnected beamsplitters of an optical circuit into a transmissive state. The optical circuit is configured to perform a linear transformation of N input optical modes, where N is a positive integer. The first plurality of beamsplitters is located along a beam path within the optical circuit and traversing a target location. The method also includes configuring a second plurality of beamsplitters in the network of interconnected beamsplitters of the optical circuit into a reflective state to reconfigure the optical circuit into a reconfigured optical circuit. The reconfigured optical circuit is configured to perform a linear transformation on M input optical modes, where M is a positive integer less than N. The second plurality of beamsplitters is located along at least one edge of the optical circuit.Type: ApplicationFiled: September 25, 2020Publication date: April 1, 2021Applicant: Xanadu Quantum Technologies Inc.Inventors: Kamil BRADLER, Ish DHAND
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Publication number: 20210096443Abstract: An apparatus includes a first optical circuit and a second optical circuit. The first optical circuit has a network of interconnected interferometers to perform an M-mode universal transformation on N input optical modes that are divided into (M?1) groups of pulses. The first optical circuit also includes M input ports. Each input port of a first (M?1) input ports is configured to receive a corresponding group of pulses in the (M?1) groups of pulses. The first optical circuit also includes M output ports and a first delay line to couple an Mth output port with an Mth input port. The second optical circuit includes a network of beamsplitters and swap gates to perform a (2M?3)-mode residual transformation. The first optical circuit and the second optical circuit are configured to perform an arbitrary N-mode unitary transformation to the N input optical modes via a rectangular architecture.Type: ApplicationFiled: September 29, 2020Publication date: April 1, 2021Inventors: Ish DHAND, Shreya PRASANNA KUMAR