Patents by Inventor Neereja Sundaresan
Neereja Sundaresan 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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Publication number: 20230418706Abstract: Techniques for using stark tone pulses to mitigate cross-resonance collision in qubits are presented. A tone management component can control application of pulses to qubits by a tone generator component to mitigate undesirable frequency collisions between qubits. The tone generator component (TGC) can apply an off-resonant tone pulse to a qubit during a gate to induce a stark shift. TGC can apply a cross-resonance tone pulse to a control qubit at a frequency associated with the qubit, wherein the frequency can be stark shifted based on the off-resonant tone pulse. The qubit can be a target qubit, the control qubit itself, or a spectator qubit that can be coupled to the target qubit or the control qubit. The gate can be a cross-resonance gate, a two-qubit gate, or a measurement gate that can utilize an echo sequence, a target rotary, or active cancellation.Type: ApplicationFiled: September 6, 2023Publication date: December 28, 2023Inventors: Isaac Lauer, Neereja Sundaresan, Emily Pritchett
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Patent number: 11803441Abstract: Techniques regarding calibrating one or more quantum decoder algorithms are provided. For example, one or more embodiments described herein can comprise a system, which can comprise a memory that can store computer executable components. The system can also comprise a processor, operably coupled to the memory, and that can execute the computer executable components stored in the memory. The computer executable components can comprise a correlation inversion decoder component that can calibrate a quantum decoder algorithm for decoding a quantum error-correcting code by estimating hyperedge probabilities of a decoding hypergraph that are consistent with a syndrome dataset.Type: GrantFiled: September 30, 2021Date of Patent: October 31, 2023Assignee: International Business Machines CorporationInventors: Edward Hong Chen, Andrew W. Cross, Youngseok Kim, Neereja Sundaresan, Maika Takita, Antonio Corcoles-Gonzalez, Theodore James Yoder
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Patent number: 11789812Abstract: Techniques for using stark tone pulses to mitigate cross-resonance collision in qubits are presented. A tone management component can control application of pulses to qubits by a tone generator component to mitigate undesirable frequency collisions between qubits. The tone generator component (TGC) can apply an off-resonant tone pulse to a qubit during a gate to induce a stark shift. TGC can apply a cross-resonance tone pulse to a control qubit at a frequency associated with the qubit, wherein the frequency can be stark shifted based on the off-resonant tone pulse. The qubit can be a target qubit, the control qubit itself, or a spectator qubit that can be coupled to the target qubit or the control qubit. The gate can be a cross-resonance gate, a two-qubit gate, or a measurement gate that can utilize an echo sequence, a target rotary, or active cancellation.Type: GrantFiled: November 15, 2021Date of Patent: October 17, 2023Assignee: International Business Machines CorporationInventors: Isaac Lauer, Neereja Sundaresan, Emily Pritchett
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Patent number: 11751491Abstract: Systems and techniques that facilitate mapping a heavy-hex qubit connection topology to a rectilinear physical qubit layout are provided. In various embodiments, a device can comprise a qubit lattice on a substrate. In various aspects, the qubit lattice can comprise one or more first qubit tiles. In various cases, the one or more first qubit tiles can have a first shape. In various instances, the qubit lattice can further comprise one or more second qubit tiles. In various cases, the one or more second qubit tiles can have a second shape. In various aspects, the one or more first qubit tiles can be tessellated with the one or more second qubit tiles.Type: GrantFiled: July 22, 2020Date of Patent: September 5, 2023Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Isaac Lauer, Neereja Sundaresan
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Patent number: 11695483Abstract: Systems, computer-implemented methods, and/or computer program products that can facilitate target qubit decoupling in an echoed cross-resonance gate are provided. According to an embodiment, a computer-implemented method can comprise receiving, by a system operatively coupled to a processor, both a cross-resonance pulse and a decoupling pulse at a target qubit. The cross-resonance pulse propagates to the target qubit via a control qubit. The computer-implemented method can further comprise receiving, by the system, a state inversion pulse at the control qubit. The computer-implemented method can further comprise receiving, by the system, both a phase-inverted cross-resonance pulse and a phase-inverted decoupling pulse at the target qubit. The phase-inverted cross-resonance pulse propagates to the target qubit via the control qubit.Type: GrantFiled: February 19, 2020Date of Patent: July 4, 2023Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Isaac Lauer, Neereja Sundaresan
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Publication number: 20230153199Abstract: Techniques for using stark tone pulses to mitigate cross-resonance collision in qubits are presented. A tone management component can control application of pulses to qubits by a tone generator component to mitigate undesirable frequency collisions between qubits. The tone generator component (TGC) can apply an off-resonant tone pulse to a qubit during a gate to induce a stark shift. TGC can apply a cross-resonance tone pulse to a control qubit at a frequency associated with the qubit, wherein the frequency can be stark shifted based on the off-resonant tone pulse. The qubit can be a target qubit, the control qubit itself, or a spectator qubit that can be coupled to the target qubit or the control qubit. The gate can be a cross-resonance gate, a two-qubit gate, or a measurement gate that can utilize an echo sequence, a target rotary, or active cancellation.Type: ApplicationFiled: November 15, 2021Publication date: May 18, 2023Inventors: Isaac Lauer, Neereja Sundaresan, Emily Pritchett
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Publication number: 20230094612Abstract: Techniques regarding calibrating one or more quantum decoder algorithms are provided. For example, one or more embodiments described herein can comprise a system, which can comprise a memory that can store computer executable components. The system can also comprise a processor, operably coupled to the memory, and that can execute the computer executable components stored in the memory. The computer executable components can comprise a correlation inversion decoder component that can calibrate a quantum decoder algorithm for decoding a quantum error-correcting code by estimating hyperedge probabilities of a decoding hypergraph that are consistent with a syndrome dataset.Type: ApplicationFiled: September 30, 2021Publication date: March 30, 2023Inventors: Edward Hong Chen, Andrew W. Cross, Youngseok Kim, Neereja Sundaresan, Maika Takita, Antonio Corcoles-Gonzalez, Theodore James Yoder
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Publication number: 20220416392Abstract: Techniques regarding an embedded microstrip transmission line implemented in one more superconducting microwave electronic devices are provided. For example, one or more embodiments described herein can comprise an apparatus, which can include a superconducting material layer positioned on a raised portion of a dielectric substrate. The raised portion can extend from a surface of the dielectric substrate. The apparatus can also comprise a dielectric film that covers at least a portion of the superconducting material layer and the raised portion of the dielectric substrate.Type: ApplicationFiled: September 7, 2022Publication date: December 29, 2022Inventors: Isaac Lauer, William Francis Landers, Srikanth Srinivasan, Neereja Sundaresan
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Patent number: 11469485Abstract: Techniques regarding an embedded microstrip transmission line implemented in one more superconducting microwave electronic devices are provided. For example, one or more embodiments described herein can comprise an apparatus, which can include a superconducting material layer positioned on a raised portion of a dielectric substrate. The raised portion can extend from a surface of the dielectric substrate. The apparatus can also comprise a dielectric film that covers at least a portion of the superconducting material layer and the raised portion of the dielectric substrate.Type: GrantFiled: October 21, 2020Date of Patent: October 11, 2022Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Isaac Lauer, William Francis Landers, Srikanth Srinivasan, Neereja Sundaresan
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Publication number: 20220123449Abstract: Techniques regarding an embedded microstrip transmission line implemented in one more superconducting microwave electronic devices are provided. For example, one or more embodiments described herein can comprise an apparatus, which can include a superconducting material layer positioned on a raised portion of a dielectric substrate. The raised portion can extend from a surface of the dielectric substrate. The apparatus can also comprise a dielectric film that covers at least a portion of the superconducting material layer and the raised portion of the dielectric substrate.Type: ApplicationFiled: October 21, 2020Publication date: April 21, 2022Inventors: Isaac Lauer, William Francis Landers, Srikanth Srinivasan, Neereja Sundaresan
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Publication number: 20220028927Abstract: Systems and techniques that facilitate mapping a heavy-hex qubit connection topology to a rectilinear physical qubit layout are provided. In various embodiments, a device can comprise a qubit lattice on a substrate. In various aspects, the qubit lattice can comprise one or more first qubit tiles. In various cases, the one or more first qubit tiles can have a first shape. In various instances, the qubit lattice can further comprise one or more second qubit tiles. In various cases, the one or more second qubit tiles can have a second shape. In various aspects, the one or more first qubit tiles can be tessellated with the one or more second qubit tiles. In various embodiments, the qubit lattice can exhibit a rectilinear physical layout. In various embodiments, the one or more first qubit tiles tessellated with the one or more second qubit tiles can form a heavy-hex qubit connection topology in the rectilinear physical layout of the qubit lattice.Type: ApplicationFiled: July 22, 2020Publication date: January 27, 2022Inventors: Isaac Lauer, Neereja Sundaresan
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Publication number: 20210258079Abstract: Systems, computer-implemented methods, and/or computer program products that can facilitate target qubit decoupling in an echoed cross-resonance gate are provided. According to an embodiment, a computer-implemented method can comprise receiving, by a system operatively coupled to a processor, both a cross-resonance pulse and a decoupling pulse at a target qubit. The cross-resonance pulse propagates to the target qubit via a control qubit. The computer-implemented method can further comprise receiving, by the system, a state inversion pulse at the control qubit. The computer-implemented method can further comprise receiving, by the system, both a phase-inverted cross-resonance pulse and a phase-inverted decoupling pulse at the target qubit. The phase-inverted cross-resonance pulse propagates to the target qubit via the control qubit.Type: ApplicationFiled: February 19, 2020Publication date: August 19, 2021Inventors: Isaac Lauer, Neereja Sundaresan