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Direct transfer of classical non-separable states into hybrid entangled two photon states

Jabir, M. V., Apurv Chaitanya, N., Mathew, Manoj, Samanta, G. K.·2017·Scientific Reports
DOI 10.1038/s41598-017-07318-1PMC PMC5544695
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Abstract

Hybrid entangled states, having entanglement between different degrees-of-freedom (DoF) of a particle pair, are of great interest for quantum information science and communication protocols. Among different DoFs, the hybrid entangled states encoded with polarization and orbital angular momentum (OAM) allow the generation of qubit-qudit entangled states, macroscopic entanglement with very high quanta of OAM and improvement in angular resolution in remote sensing. Till date, such hybrid entangled states are generated by using a high-fidelity polarization entangled states and subsequent imprinting of chosen amount of OAM using suitable mode converters such as spatial light modulator in complicated experimental schemes. Given that the entangled sources have feeble number of photons, loss of photons during imprinting of OAM using diffractive optical elements limits the use of such hybrid states for practical applications. Here we report, on a simple generic experimental scheme to generate hybrid entangled states in polarization and OAM through direct transfer of classical non-separable states of the pump beam in parametric down conversion process. As a proof of principle, using local non-separable pump states of OAM mode l = 3, we have produced quantum hybrid entangled states with entanglement witness parameter of ~1.25 ± 0.03 violating by 8 standard deviation.

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Crossref · 10.1038/s41598-017-07318-1

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  • Alignment-free OAM states have unlocked advancements in free-space quantum key distribution and quantum communication with high bit exchange rates.

    “These features have unlocked a number of advancements in free-space quantum key distribution and quantum communication [67,81,86,[96][97][98][99][100][101][102][103] with high bit exchange rates [104,105].”

    From Photonic quantum information processing: a review (2019) · cites this paper as [105]

    The Introduction describes polarization–OAM hybrid entanglement as useful for quantum information and identifies quantum communication and cryptography as applications of entanglement. It does not report alignment-free OAM states unlocking advances in free-space quantum key distribution or quantum communication. The high-bit-rate clause has separate citations in the citing sentence and is not attributed to this source. (LLM, conf=0.78)

    Experimental — accuracy not yet measured

  • Two approaches exist to circumvent these issues: reducing the transmission loss using free-space communication and decoherence-free subspaces, or employing quantum repeaters.

    “Notwithstanding, two approaches exist to circumvent these issues: reducing the transmission loss using free-space communication [43,96,105,348,350,351,393-399] and decoherencefree subspaces [42,116,385,386,[388][389][390][391], or employing quantum repeaters.”

    From Photonic quantum information processing: a review (2019) · cites this paper as [105]

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Citations

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Research works printed but not linked: 31

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Metadata

Authors
Jabir, M. V., Apurv Chaitanya, N., Mathew, M., & Samanta, G. K.
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2017-08-04
Volume
7
Issue
1
ISSN
2045-2322
DOI
10.1038/s41598-017-07318-1
PMC
PMC5544695
Cited by
30
References
6
Language
en
Licence

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