Efficient fusion of photonic W-states with nonunitary partial-swap gates
Abstract
We introduce a nonunitary partial-swap gate for fusing arbitrary small-sized photonic W-states into a large-scale entangled network of W-state efficiently without ancillary photons. A partial-swap gate is designed in an optical architecture based on linear optics elements. By introducing auxiliary degree of freedom, this gate provides a higher success probability with less cost. Our implementation can create a larger target state with a simpler set-up than previous proposals for W-state fusion. Also all 'garbage' states are recyclable, i.e., there is no complete failure output in our scheme in principle.
- Publication:
-
New Journal of Physics
- Pub Date:
- September 2020
- DOI:
- 10.1088/1367-2630/abb279
- arXiv:
- arXiv:2011.11195
- Bibcode:
- 2020NJPh...22i3051W
- Keywords:
-
- W-state fusion;
- multipartite entanglement;
- quantum gate;
- Quantum Physics
- E-Print:
- 13 pages, 5 figures, 4 tables