Multiphoton non-local quantum interference controlled by an undetected photon.

ABSTRACT: The interference of quanta lies at the heart of quantum physics. The multipartite generalization of single-quanta interference creates entanglement, the coherent superposition of states shared by several quanta. Entanglement allows non-local correlations between many quanta and hence is a key resource for quantum information technology. Entanglement is typically considered to be essential for creating non-local quantum interference. Here, we show that this is not the case and demonstrate multiphoton non-local quantum interference that does not require entanglement of any intrinsic properties of the photons. We harness the superposition of the physical origin of a four-photon product state, which leads to constructive and destructive interference with the photons' mere existence. With the i

SUBMITTER: Qian K 

PROVIDER: S-EPMC10023773 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature