Quantum SWAP gate realized with CZ and iSWAP gates in a superconducting architecture
Journal article, 2025
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.
qubit
quantum information science
superconducting microwave devices
Author
Christian Krizan
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Janka Biznárová
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Liangyu Chen
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Emil Hogedal
Quantum Technology PhD Students
Amr Osman
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Christopher Warren
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Sandoko Kosen
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Hangxi Li
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Tahereh Abad
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
Anuj Aggarwal
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Marco Caputo
Technical Research Centre of Finland (VTT)
Jorge Fernandez Pendas
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
Akshay Gaikwad
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
L. Gronberg
Technical Research Centre of Finland (VTT)
Andreas Nylander
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Robert Rehammar
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Marcus Rommel
Chalmers, Microtechnology and Nanoscience (MC2), Nanofabrication Laboratory
Olga Yuzefovych
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Anton Frisk Kockum
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
J. Govenius
Technical Research Centre of Finland (VTT)
Giovanna Sammarco Tancredi
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Jonas Bylander
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
New Journal of Physics
13672630 (eISSN)
Vol. 27 7 074507Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1088/1367-2630/adeba7