Experimental verification of entanglement generated in a plasmonic system
arXiv:1705.01962 · doi:10.1021/acs.nanolett.7b03372
Abstract
A core process in many quantum tasks is the generation of entanglement. It is being actively studied in a variety of physical settings - from simple bipartite systems to complex multipartite systems. In this work we experimentally study the generation of bipartite entanglement in a nanophotonic system. Entanglement is generated via the quantum interference of two surface plasmon polaritons in a beamsplitter structure, i.e. utilising the Hong-Ou-Mandel (HOM) effect, and its presence is verified using quantum state tomography. The amount of entanglement is quantified by the concurrence and we find values of up to 0.77 +/- 0.04. Verifying entanglement in the output state from HOM interference is a nontrivial task and cannot be inferred from the visibility alone. The techniques we use to verify entanglement could be applied to other types of photonic system and therefore may be useful for the characterisation of a range of different nanophotonic quantum devices.
arXiv comment7 pages, 4 figures
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- Quantum Plasmonic Sensors
- Quantum plasmonic N00N state in a silver nanowire and its use for quantum sensing
- Generation of a frequency-degenerate four-photon entangled state using a silicon nanowire
- Polaritonic Quantum Matter
- Probing decoherence in plasmonic waveguides in the quantum regime
- Suppressing Decoherence in Quantum Plasmonic Systems by Spectral Hole Burning Effect
- Time-Resolved Detection of Photon-Surface-Plasmon Coupling at the Single-Quanta Level
- Quantum random number generation using an on-chip nanowire plasmonic waveguide
- Atom-Mechanical Hong-Ou-Mandel Interference