Two-qubit couplings of singlet-triplet qubits mediated by one quantum state
We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via one quantum state (QS). The QS can be provided by a quantum dot itself or by another confined system. The orbital energies of the QS are tunable using an electric gate close to the QS, which change...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-07, Vol.90 (4), Article 045404 |
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| container_title | Physical review. B, Condensed matter and materials physics |
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| creator | Mehl, Sebastian Bluhm, Hendrik DiVincenzo, David P. |
| description | We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via one quantum state (QS). The QS can be provided by a quantum dot itself or by another confined system. The orbital energies of the QS are tunable using an electric gate close to the QS, which changes the interactions between the STQs independent of their single-qubit parameters. Short gating sequences exist for controlled NOT (CNOT) operations. We show that realistic quantum dot setups permit excellent entangling operations with gate infidelities below 10 super(-3), which is lower than the quantum error correction threshold of the surface code. We consider limitations from fabrication errors, hyperfine interactions, spin-orbit interactions, and charge noise in GaAs and Si heterostructures. |
| doi_str_mv | 10.1103/PhysRevB.90.045404 |
| format | Article |
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B, Condensed matter and materials physics</title><description>We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via one quantum state (QS). The QS can be provided by a quantum dot itself or by another confined system. The orbital energies of the QS are tunable using an electric gate close to the QS, which changes the interactions between the STQs independent of their single-qubit parameters. Short gating sequences exist for controlled NOT (CNOT) operations. We show that realistic quantum dot setups permit excellent entangling operations with gate infidelities below 10 super(-3), which is lower than the quantum error correction threshold of the surface code. We consider limitations from fabrication errors, hyperfine interactions, spin-orbit interactions, and charge noise in GaAs and Si heterostructures.</description><subject>Charge</subject><subject>Condensed matter</subject><subject>Gallium arsenide</subject><subject>Gallium arsenides</subject><subject>Gates</subject><subject>Orbitals</subject><subject>Qubits (quantum computing)</subject><subject>Thresholds</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNo1kEtLxDAUhYMoOI7-AVdZusl485o2Sx18oaDICO5C0txqpa9pUmX-vdXR1TkcPs7iI-SUw4JzkOdP79v4jJ-XCwMLUFqB2iMzrjUwIfXr_tTB5Ay44IfkKMYPAK6MEjNyv_7q2Gb0VaJFN_Z11b5F2pU0TqXGxNJQ9VPSXyTSBkPlEgbqt7RrcZpdm8aGxjStx-SgdHXEk7-ck5frq_Xqlj083tytLh5YIXJIzBdlKV2eZbD0ENAo7hExLEEBepmrILg3vpTCKe-NAyPRh6V2hdR5CArknJztfvuh24wYk22qWGBduxa7MVqegck0N4ZPqNihxdDFOGBp-6Fq3LC1HOyPOftvzhqwO3PyG2FmZR4</recordid><startdate>20140709</startdate><enddate>20140709</enddate><creator>Mehl, Sebastian</creator><creator>Bluhm, Hendrik</creator><creator>DiVincenzo, David P.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>H8D</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20140709</creationdate><title>Two-qubit couplings of singlet-triplet qubits mediated by one quantum state</title><author>Mehl, Sebastian ; Bluhm, Hendrik ; DiVincenzo, David P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c280t-bcff3a87706b0de941beeed6040eb384d21b9bf32a4bb9a093ebd65ac358dd403</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Charge</topic><topic>Condensed matter</topic><topic>Gallium arsenide</topic><topic>Gallium arsenides</topic><topic>Gates</topic><topic>Orbitals</topic><topic>Qubits (quantum computing)</topic><topic>Thresholds</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mehl, Sebastian</creatorcontrib><creatorcontrib>Bluhm, Hendrik</creatorcontrib><creatorcontrib>DiVincenzo, David P.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physical review. B, Condensed matter and materials physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mehl, Sebastian</au><au>Bluhm, Hendrik</au><au>DiVincenzo, David P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Two-qubit couplings of singlet-triplet qubits mediated by one quantum state</atitle><jtitle>Physical review. B, Condensed matter and materials physics</jtitle><date>2014-07-09</date><risdate>2014</risdate><volume>90</volume><issue>4</issue><artnum>045404</artnum><issn>1098-0121</issn><eissn>1550-235X</eissn><abstract>We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via one quantum state (QS). The QS can be provided by a quantum dot itself or by another confined system. 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| fulltext | fulltext |
| identifier | ISSN: 1098-0121 |
| ispartof | Physical review. B, Condensed matter and materials physics, 2014-07, Vol.90 (4), Article 045404 |
| issn | 1098-0121 1550-235X |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1709751991 |
| source | American Physical Society Journals |
| subjects | Charge Condensed matter Gallium arsenide Gallium arsenides Gates Orbitals Qubits (quantum computing) Thresholds |
| title | Two-qubit couplings of singlet-triplet qubits mediated by one quantum state |
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