Quantum SWAP gate realized with CZ and iSWAP gates in a superconducting architecture
Abstract It is advantageous for any quantum processor to support different classes of two-qubit quantum logic gates when compiling quantum circuits, a property that is typically not present in existing platforms. In particular, access to a gate set that includes support for the CZ-, iSWAP-, and SWAP-type families of gates renders conversions between these gate families unnecessary during compilation, as any two-qubit Clifford gate can be executed using at most one two-qubit gate from this set, plus additional single-qubit gates. We experimentally demonstrate that a SWAP gate can be decomposed into one iSWAP gate followed by one CZ gate, affirming a more efficient compilation strategy over the conventional approach that relies on three iSWAP or three CZ gates to replace a SWAP gate. Our implementation makes use of a superconducting quantum processor design based on fixed-frequency transmon qubits coupled together by a parametrically modulated tunable transmon coupler, extending this platform’s native gate set so that any two-qubit Clifford unitary matrix can be realized using no more than two two-qubit gates and single-qubit gates.
Authors
- Leif Grönberg (ORCID: https://orcid.org/0000-0002-9102-976X)
- Akshay Gaikwad (ORCID: https://orcid.org/0009-0001-2243-6185)
- Jonas Bylander (ORCID: https://orcid.org/0000-0003-4521-710X)
- Hang-Xi Li (ORCID: https://orcid.org/0000-0002-2578-306X)
- Joonas Govenius (ORCID: https://orcid.org/0000-0002-7208-9556)
- Andreas Nylander (ORCID: https://orcid.org/0000-0002-9724-1892)
- Robert Rehammar (ORCID: https://orcid.org/0000-0001-8167-3810)
- O. I. Yuzephovich
- Janka Biznárová (ORCID: https://orcid.org/0000-0002-8887-8816)
- Giovanna Tancredi (ORCID: https://orcid.org/0000-0002-3628-8398)
- Anton Frisk Kockum (ORCID: https://orcid.org/0000-0002-2534-3021)
- Jorge Fernández-Pendás (ORCID: https://orcid.org/0000-0003-3814-9364)
- Marco Caputo (ORCID: https://orcid.org/0000-0001-7452-0998)
- Tahereh Abad (ORCID: https://orcid.org/0000-0002-6277-3477)
- Amr Osman (ORCID: https://orcid.org/0000-0002-0290-1000)
- Christopher Warren (ORCID: https://orcid.org/0000-0001-6195-2708)
- Marcus Rommel (ORCID: https://orcid.org/0000-0002-3026-3907)
- Sandoko Kosen (ORCID: https://orcid.org/0000-0001-9560-9932)
- Christian Križan (ORCID: https://orcid.org/0000-0002-5059-7998)
- Liangyu Chen (ORCID: https://orcid.org/0000-0003-0394-6208)
- Anuj Aggarwal (ORCID: https://orcid.org/0009-0008-0323-3658)
- Emil Hogedal
Institutions
- Chalmers University of Technology (SE)
- VTT Technical Research Centre of Finland (FI)
Publication Details
- Journal
- New Journal of Physics
- Published
- 2025-07-01
- DOI
- https://doi.org/10.1088/1367-2630/adeba7
- Citations
- 6
- Primary Topic
- Quantum Computing Algorithms and Architecture
- Type
- article
- Field-Weighted Citation Impact
- 14.89
Funders
- Knut och Alice Wallenbergs Stiftelse
- Vetenskapsrådet
- Stiftelsen för Strategisk Forskning
- Horizon 2020 Framework Programme