Direct and efficient verification of entanglement between two multimode–multiphoton systems
Linear-optic photonic networks with multiple single-photon inputs are attracting attention due to their great potential for quantum computation, quantum communication, and quantum sensing. They are also essential for verifying quantum advantages via boson sampling schemes. The quantum coherence of g...
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Veröffentlicht in: | Optica 2020-11, Vol.7 (11), p.1517 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Linear-optic photonic networks with multiple single-photon inputs are
attracting attention due to their great potential for quantum
computation, quantum communication, and quantum sensing. They are also
essential for verifying quantum advantages via boson sampling schemes.
The quantum coherence of generated multimode–multiphoton states is
crucial for various applications. However, the coherence is invisible
in the normally obtained photon number distributions, which strictly
limits the efficiency of entanglement verification between
multimode–multiphoton systems since the required resources for quantum
state tomography increase exponentially as the number of photons/modes
increases. In this paper, we report the experimental demonstration of
direct and efficient verification of entanglement between two
multimode–multiphoton systems (one photon in three modes and two
photons in three modes) using just two sets of classical correlation
tables with and without a discrete Fourier transformation of the
optical modes, clearly demonstrating a dramatic reduction in the
resources required for entanglement verification. Our experimental
demonstration paves the way to understanding the coherence and
entanglement of multi-partite systems, not only for photons but for
other quantum resources with high-dimensional degrees of freedom. |
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ISSN: | 2334-2536 2334-2536 |
DOI: | 10.1364/OPTICA.397943 |