Loss-tolerant state engineering for quantum-enhanced metrology via the reverse Hong-Ou-Mandel effect
| Autor: | Ilya A. Fedorov, Philippe Grangier, Alexander E. Ulanov, A. I. Lvovsky, Demid V. Sychev |
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| Přispěvatelé: | Russian Quantum Center, Moscow Institute of Physics and Technology [Moscow] (MIPT), P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS), Russian Academy of Sciences [Moscow] (RAS), Laboratoire Charles Fabry / Optique Quantique, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Institute for Quantum Science and Technology, University of Calgary |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] Multidisciplinary Quantum limit Science Quantum sensor General Physics and Astronomy General Chemistry Quantum capacity Quantum channel 01 natural sciences General Biochemistry Genetics and Molecular Biology Article 010305 fluids & plasmas Quantum state Quantum mechanics 0103 physical sciences Electronic engineering Quantum metrology Coherent states Hong–Ou–Mandel effect 010306 general physics ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016) Nature Communications Nature Communications, Nature Publishing Group, 2016, 7, pp.11925. ⟨10.1038/ncomms11925⟩ |
| ISSN: | 2041-1723 |
| Popis: | Highly entangled quantum states, shared by remote parties, are vital for quantum communications and metrology. Particularly promising are the N00N states—entangled N-photon wavepackets delocalized between two different locations—which outperform coherent states in measurement sensitivity. However, these states are notoriously vulnerable to losses, making them difficult to both share them between remote locations and recombine in order to exploit interference effects. Here we address this challenge by utilizing the reverse Hong–Ou–Mandel effect to prepare a high-fidelity two-photon N00N state shared between two parties connected by a lossy optical medium. We measure the prepared state by two-mode homodyne tomography, thereby demonstrating that the enhanced phase sensitivity can be exploited without recombining the two parts of the N00N state. Finally, we demonstrate the application of our method to remotely prepare superpositions of coherent states, known as Schrödinger's cat states. N00N states are promising for quantum communications and metrology, but are vulnerable to losses. Here the authors develop a technique for preparing high-fidelity two-photon N00N states in a loss-free fashion, and demonstrate enhanced phase sensitivity without requiring recombination. |
| Databáze: | OpenAIRE |
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