# US 12,217,133 B2 · Methods and apparatuses for performing echo sequence > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,133 B2 - Document ID: US12217133B2 - Status: Granted - Kind: B2 - Application number: 17/933,740 - Filed: 2022-09-20 - Published: 2023-11-16 - Granted: 2025-02-04 - Earliest claimed: 2021-07-16 - Assignees: IonQ, Inc. - Applicants: IonQ, Inc. - Inventors: Michael Lurie Goldman; Laird Nicholas Egan; Jeremy Matthew Sage - Web page: https://patentgrep.com/patent/US12217133B2 ## CPC - G06N 10/40: Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control - G06N 10/20: Models of quantum computing, e.g. quantum circuits or universal quantum computers - G21K 1/20: for confining charged particles or handling confined charged particles, e.g. ion traps - G02F 1/0102: {Constructional details, not otherwise provided for in this subclass} - G02F 1/11: based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves (acousto-optical deflection G02F1/33) - G02F 2201/16: series; tandem - G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS - G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract Aspects of the present disclosure may include a method and/or a system for identifying an ion chain having a plurality of trapped ions, selecting at least two non-consecutive trapped ions in the ion chain for implementing a qubit, applying at least a first Raman beam to shuttle at least one neighbor ion of the at least two non-consecutive trapped ions from a ground state to a metastable state, and applying at least a second Raman beam to one or more of the at least two non-consecutive trapped ions, after shuttling the at least one neighbor ion to the metastable state, to transition from a first manifold to a second manifold. ## Claims ### Claim 1 A method for performing an echo sequence in a quantum information processing (QIP) system, comprising: applying a first global optical beam to a plurality of dual space single species (DSSS) trapped ions to transition the plurality of DSSS trapped ions from a first state in a first manifold to a first state in a second manifold; and applying, at a time after applying the first global optical beam, a second global optical beam to the plurality of DSSS trapped ions to transition: from the first state in the second manifold to the first state in the first manifold; and from a second state in the first manifold to a second state in the second manifold. ### Claim 2 (depends on 1) The method of claim 1, further comprising: applying a Raman beam to transition at least a readout qubit of the plurality of DSSS trapped ions from a first state of the first manifold to a second state of the first manifold; applying a third global optical beam to transition a remainder of the plurality of DSSS trapped ions from the first state in the first manifold to the first state in the second manifold; applying a global detection laser to the at least one readout qubit to obtain information associated with the at least one readout qubit; and pumping the at least one readout qubit from the second state in the first manifold to the first state in the first manifold. ### Claim 3 (depends on 2) The method of claim 2, further comprising: applying a fourth global optical beam to transition the plurality of DSSS trapped ions from the second state in the second manifold to the second state in the first manifold; applying a second Raman beam to each of the at least one readout qubit based on the information obtained; applying a fifth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; and applying a sixth global optical beam to transition the plurality of DSSS trapped ions from the second state in the second manifold to the second state in the first manifold. ### Claim 4 (depends on 2) The method of claim 2, further comprising: applying a fourth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; applying a fifth global optical beam to transition the plurality of DSSS trapped ions from the second state in the first manifold to the second state in the second manifold; applying a sixth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; and applying a second Raman beam to each of the at least one readout qubit based on the information obtained; and applying a seventh global optical beam to transition the plurality of DSSS trapped ions from the second state in the first manifold to the second state in the second manifold. ### Claim 5 (depends on 1) The method of claim 1, wherein the first manifold is a ground manifold and the second manifold is a metastable manifold. ### Claim 6 (depends on 1) The method of claim 1, wherein the plurality of DSSS trapped ions includes at least a data qubit and at least a readout qubit. ### Claim 7 (depends on 1) The method of claim 1, wherein applying the second global optical beam further comprises applying the second global optical beam to cancel out noises generated during the applying of the first global optical beam. ### Claim 8 A non-transitory computer readable medium having instructions stored therein that, when executed by one or more processors of a quantum information processing (QIP) system, cause the one or more processors to: apply a first global optical beam to a plurality of dual space single species (DSSS) trapped ions to transition the plurality of DSSS trapped ions from a first state in a first manifold to a first state in a second manifold; and apply, at a time after applying the first global optical beam, a second global optical beam to the plurality of DSSS trapped ions to transition: from the first state in the second manifold to the first state in the first manifold; and from a second state in the first manifold to a second state in the second manifold. ### Claim 9 (depends on 8) The non-transitory computer readable medium of claim 8, further comprising instructions for: applying a Raman beam to transition at least a readout qubit of the plurality of DSSS trapped ions from a first state of the first manifold to a second state of the first manifold; applying a third global optical beam to transition a remainder of the plurality of DSSS trapped ions from the first state in the first manifold to the first state in the second manifold; applying a global detection laser to the at least one readout qubit to obtain information associated with the at least one readout qubit; and pumping the at least one readout qubit from the second state in the first manifold to the first state in the first manifold. ### Claim 10 (depends on 9) The non-transitory computer readable medium of claim 9, further comprising instructions for: applying a fourth global optical beam to transition the plurality of DSSS trapped ions from the second state in the second manifold to the second state in the first manifold; applying a second Raman beam to each of the at least one readout qubit based on the information obtained; applying a fifth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; and applying a sixth global optical beam to transition the plurality of DSSS trapped ions from the second state in the second manifold to the second state in the first manifold. ### Claim 11 (depends on 9) The non-transitory computer readable medium of claim 9, further comprising instructions for: applying a fourth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; applying a fifth global optical beam to transition the plurality of DSSS trapped ions from the second state in the first manifold to the second state in the second manifold; applying a sixth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; applying a second Raman beam to each of the at least one readout qubit based on the information obtained; and applying a seventh global optical beam to transition the plurality of DSSS trapped ions from the second state in the first manifold to the second state in the second manifold. ### Claim 12 (depends on 9) The non-transitory computer readable medium of claim 9, wherein the first manifold is a ground manifold and the second manifold is a metastable manifold. ### Claim 13 (depends on 9) The non-transitory computer readable medium of claim 9, wherein the plurality of DSSS trapped ions includes at least a data qubit and at least a readout qubit. ### Claim 14 (depends on 9) The non-transitory computer readable medium of claim 9, wherein the instructions for applying the second global optical beam further comprises instructions for applying the second global optical beam to cancel out noises generated during the applying of the first global optical beam. ### Claim 15 A quantum information processing (QIP) system, comprising: a first light source configured to apply: a first global optical beam to a plurality of dual space single species (DSSS) trapped ions to transition the plurality of DSSS trapped ions from a first state in a first manifold to a first state in a second manifold; and at a time after applying the first global optical beam, a second global optical beam to the plurality of DSSS trapped ions to transition: from the first state in the second manifold to the first state in the first manifold; and from a second state in the first manifold to a second state in the second manifold; and a controller configured to control at least the first light source. ### Claim 16 (depends on 15) The QIP system of claim 15, further comprising: a second light source configured to apply a Raman beam to transition at least a readout qubit of the plurality of DSSS trapped ions from a first state of the first manifold to a second state of the first manifold; a third light source configured to apply a global detection laser to the at least one readout qubit to obtain information associated with the at least one readout qubit; a fourth light source configured to pump the at least one readout qubit from the second state in the first manifold to the first state in the first manifold; and wherein the first light source is further configured to apply a third global optical beam to transition a remainder of the plurality of DSSS trapped ions from the first state in the first manifold to the first state in the second manifold. ### Claim 17 (depends on 16) The QIP system of claim 16, wherein: the first light source is further configured to apply: a fourth global optical beam to transition the plurality of DSSS trapped ions from the second state in the second manifold to the second state in the first manifold; a fifth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; and a sixth global optical beam to transition the plurality of DSSS trapped ions from the second state in the second manifold to the second state in the first manifold; and the second light source is further configured to apply a second Raman beam to each of the at least one readout qubit based on the information obtained. ### Claim 18 (depends on 16) The QIP system of claim 16, wherein: the first light source is further configured to apply: a fourth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; a fifth global optical beam to transition the plurality of DSSS trapped ions from the second state in the first manifold to the second state in the second manifold; a sixth global optical beam to toggle the plurality of DSSS trapped ions between the corresponding states in the first manifold and the second manifold; and a seventh global optical beam to transition the plurality of DSSS trapped ions from the second state in the first manifold to the second state in the second manifold; and the second slight source is further configured to apply a second Raman beam to each of the at least one readout qubit based on the information obtained. ### Claim 19 (depends on 15) The QIP system of claim 15, wherein the first manifold is a ground manifold and the second manifold is a metastable manifold. ### Claim 20 (depends on 15) The QIP system of claim 15, wherein the plurality of DSSS trapped ions includes at least a data qubit and at least a readout qubit. ### Claim 21 (depends on 15) The QIP system of claim 15, wherein applying the second global optical beam further comprises applying the second global optical beam to cancel out noises generated during the applying of the first global optical beam.