Resilience of hybrid optical angular momentum qubits to turbulence

Year: 2015

Authors: Farias OJ., D’Ambrosio V., Taballione C., Bisesto F., Slussarenko S., Aolita L., Marrucci L., Walborn SP., Sciarrino F.

Autors Affiliation: Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ, Brazil; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Univ Naples Federico II, Dipartimento Fis, I-80126 Naples, Italy; Free Univ Berlin, Dahlem Ctr Complex Quantum Syst, Berlin, Germany; CNR SPIN, I-80126 Naples, Italy; CNR, Ist Nazl Ott, I-50125 Florence, Italy.

Abstract: Recent schemes to encode quantum information into the total angular momentum of light, defining rotation-invariant hybrid qubits composed of the polarization and orbital angular momentum degrees of freedom, present interesting applications for quantum information technology. However, there remains the question as to how detrimental effects such as random spatial perturbations affect these encodings. Here, we demonstrate that alignment-free quantum communication through a turbulent channel based on hybrid qubits can be achieved with unit transmission fidelity. In our experiment, alignment-free qubits are produced with q-plates and sent through a homemade turbulence chamber. The decoding procedure, also realized with q-plates, relies on both degrees of freedom and renders an intrinsic error-filtering mechanism that maps errors into losses.

Journal/Review: SCIENTIFIC REPORTS

Volume: 5      Pages from: 8424-1  to: 8424-5

More Information: This work was supported by the FET-Open Program, within the 7th Framework Programme of the European Commission under Grant No. 255914, the EU Marie Curie Grant IEF No. 299141, PHORBITECH, FIRB-Futuro in Ricerca (HYTEQ), EU project QWAD(Quantum Waveguides Applications and Development) and the brazilian agencies CNPq, FAPERJ and the INCT- Informacao Quantica. We would like to thank C.H. Monken and S. Giacomini for helpful discussions about the turbulence machine.
KeyWords: Atmospheric-turbulence; Entanglement
DOI: 10.1038/srep08424

ImpactFactor: 5.228
Citations: 24
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