Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

On-chip quantum interference between the origins of a multi-photon state


Krenn,  M.
Department of Chemistry & Computer Science, University of Toronto;
Vector Institute for Artificial Intelligence;
External Organizations;
Krenn Research Group, Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)

(Any fulltext), 2MB

Supplementary Material (public)

(Supplementary material), 38KB


Feng, L.-T., Zhang, M., Liu, D., Cheng, Y.-J., Guo, G.-P., Dai, D.-X., et al. (2023). On-chip quantum interference between the origins of a multi-photon state. Optica, 10(1): 2103.14277, pp. 105-109. doi:10.1364/OPTICA.474750.

Cite as: https://hdl.handle.net/21.11116/0000-0009-71EB-F
Quantum mechanically, multiple particles can jointly be in a coherent superposition of two or more different states at the same time. This property is called quantum entanglement, and gives rise to characteristic nonlocal interference and stays at the heart of quantum information process. Here, rather than interference of different intrinsic properties of particles, we experimentally demonstrated coherent superposition of two different birthplaces of a four-photon state. The quantum state is created in four probabilistic photon-pair sources, two combinations of which can create photon quadruplets. Coherent elimination and revival of distributed 4-photons can be fully controlled by tuning a phase. The stringent coherence requirements are met by using a silicon-based integrated photonic chip that contains four spiral waveguides for producing photon pairs via spontaneous four-wave mixing. The experiment gives rise to peculiar nonlocal phenomena without any obvious involvement of entanglement. Besides several potential applications that exploit the new on-chip technology, it opens up the possibility for fundamental studies on nonlocality with spatially separated locations.