Analysis of a parametrically driven exchange-type gate and a two-photon excitation gate between superconducting qubits
Autor: | Marc Ganzhorn, Gian Salis, Sebastian Schmidt, Stefan Filipp, Marco Roth, Nikolaj Moll |
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Rok vydání: | 2017 |
Předmět: |
Physics
Quantum Physics 02 engineering and technology Transmon Dissipation 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Computer Science::Emerging Technologies Qubit Quantum mechanics 0103 physical sciences symbols Hardware_ARITHMETICANDLOGICSTRUCTURES 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) Superconducting quantum computing Quantum Excitation Quantum computer |
Zdroj: | Physical Review A. 96 |
ISSN: | 2469-9934 2469-9926 |
DOI: | 10.1103/physreva.96.062323 |
Popis: | A current bottleneck for quantum computation is the realization of high-fidelity two-qubit quantum operations between two or more quantum bits in arrays of coupled qubits. Gates based on parametrically driven tunable couplers offer a convenient method to entangle multiple qubits by selectively activating different interaction terms in the effective Hamiltonian. Here, we theoretically and experimentally study a superconducting qubit setup with two transmon qubits connected via a capacitively coupled tunable bus. We develop a time-dependent Schrieffer-Wolff transformation and derive analytic expressions for exchange-interaction gates swapping excitations between the qubits (iswap) and for two-photon gates creating and annihilating simultaneous two-qubit excitations (bswap). We find that the bswap gate is generally slower than the more commonly used iswap gate, but features favorable scalability properties with less severe frequency-crowding effects, which typically degrade the fidelity in multiqubit setups. Our theoretical results are backed by experimental measurements as well as exact numerical simulations including the effects of higher transmon levels and dissipation. |
Databáze: | OpenAIRE |
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