Linear optical deterministic and reconfigurable SWAP gate

Bozkurt A. B., KOCAMAN S.

QUANTUM INFORMATION PROCESSING, vol.20, no.9, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 20 Issue: 9
  • Publication Date: 2021
  • Doi Number: 10.1007/s11128-021-03205-x
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Compendex, INSPEC, zbMATH
  • Keywords: Linear optical quantum computation, SWAP gate, Dual-rail encoded single-photon qubits, Photonic integrated circuits, QUANTUM, REALIZATION, ALGORITHM
  • Middle East Technical University Affiliated: Yes


We propose a deterministic SWAP gate for dual-rail-encoded single photon qubits. The gate is constructed from waveguide crossings, Mach-Zehnder interferometers and phase shifters which provide the gate reconfigurability. Through manipulating the phase of the phase shifters, we can apply either the SWAP or identity gates. As an essential element of nearest neighbor qubit networks, the SWAP gate has a simple structure and presents minimal overhead. Providing an efficient solution to the geometric restrictions of on-chip dual-rail qubit circuits, our design may be utilized in applying large scale arbitrary unitary transformations.