Multiphoton non-local quantum interference controlled by an undetected
photon
- URL: http://arxiv.org/abs/2112.11658v2
- Date: Thu, 23 Mar 2023 09:20:14 GMT
- Title: Multiphoton non-local quantum interference controlled by an undetected
photon
- Authors: Kaiyi Qian, Kai Wang, Leizhen Chen, Zhaohua Hou, Mario Krenn, Shining
Zhu, and Xiao-Song Ma
- Abstract summary: Multipartite generalization of single-quanta interference creates entanglement, the coherent superposition of states shared by several quanta.
Entanglement is typically considered to be essential for creating non-local correlations, manifested by multipartite interference.
We show that this is not the case and demonstrate multiphoton non-local quantum interference without entanglement of any intrinsic properties of the photons.
- Score: 3.316485412174328
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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 correlations, manifested by multipartite
interference. Here, we show that this is not the case and demonstrate
multiphoton non-local quantum interference without 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 of the photons' mere existence. With the intrinsic
indistinguishability in the generation process of photons, we realize
four-photon frustrated quantum interference. We furthermore establish non-local
control of multipartite quantum interference, in which we tune the phase of one
undetected photon and observe the interference of the other three photons. Our
work paves the way for fundamental studies of non-locality and potential
applications in quantum technologies.
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