Engineering of Hong-Ou-Mandel interference with effective noise

Siltanen, Olli; Kuusela, Tom; Piilo, Jyrki

doi:10.1103/physreva.104.042201

Cited by 2 publications

(1 citation statement)

References 58 publications

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“…If a time delay occurs due, e.g., to the particle sources being desynchronized, the results of this paper can thus be restored, for example, by suitably arranging the lengths of the different paths after the BS or, referring to a photonic implementation, by inducing a proper dephasing on the particles with birefringent media prior to their collection. [53,54]…”

Section: Discussionmentioning

confidence: 99%

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

2023

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This study proposes a procedure for the robust preparation of maximally entangled states of identical fermionic qubits, studying the role played by particle statistics in the process. The protocol exploits externally activated noisy channels to reset the system to a known state. The subsequent interference effects generated at a beam splitter result in a mixture of maximally entangled Bell states and NOON states. It also discusses how every maximally entangled state of two fermionic qubits distributed over two spatial modes can be obtained from one another by fermionic passive optical transformations. Using a pseudospin‐insensitive, non‐absorbing, parity check detector, the proposed technique is thus shown to deterministically prepare any arbitrary maximally entangled state of two identical fermions. These results extend recent findings related to bosonic qubits. Finally, it analyzes the performance of the protocol for both bosons and fermions when the externally activated noisy channels are not used and the two qubits undergo standard types of noise. The results supply further insights toward viable strategies for noise‐protected entanglement exploitable in quantum‐enhanced technologies.

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Section: Discussionmentioning

confidence: 99%

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

2023

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Hong–Ou–Mandel interference of longitudinal spatially coherent beams

2023

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The Hong–Ou–Mandel (HOM) interference of two light beams having different longitudinal spatial coherence properties is investigated theoretically and experimentally. The normalized second-order correlation function ( g ( 2 ) ) is determined for the interfering photons from two sources of different angular widths using Feynman’s path integral theory. We find that the difference in angular width of the sources has an explicit impact on the HOM interference pattern, which can be quantified through the visibility and full width at half maxima of the HOM dip. The effect of distinguishability of the interfering longitudinally spatially coherent beams on the HOM dip is verified experimentally and is analogous to non-classical HOM interference. The magnitude of the angular width of beams manifested through the difference in angular width has a significant impact. Along with the difference of two sources, this HOM scheme is sensitive to the angular spectrum width of each source. The enhanced sensitivity can be useful in the remote sensing of objects and beams in metrological applications. This work can play a significant role in fundamental and applied physics.

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Engineering of Hong-Ou-Mandel interference with effective noise

Cited by 2 publications

References 58 publications

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

Hong–Ou–Mandel interference of longitudinal spatially coherent beams

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