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Two-mode Schrodinger-cat states with nonlinear optomechanics : generation and verification of non-Gaussian mechanical entanglement

Kanari-Naish, Lydia A. (author)
Imperial Coll London, Blacken Lab, QOLS, London SW7 2BW, England.
Clarke, Jack (author)
Imperial Coll London, Blacken Lab, QOLS, London SW7 2BW, England.
Qvarfort, Sofia (author)
Stockholms universitet,Fysikum,Nordiska institutet för teoretisk fysik (Nordita),Imperial College London, United Kingdom,Nordita SU, Imperial Coll London, Blacken Lab, QOLS, London SW7 2BW, England.;UCL, Dept Phys & Astron, London W E 6BT, England.;Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.
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Vanner, Michael R. (author)
Imperial Coll London, Blacken Lab, QOLS, London SW7 2BW, England.
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Imperial Coll London, Blacken Lab, QOLS, London SW7 2BW, England Fysikum (creator_code:org_t)
2022-05-26
2022
English.
In: Quantum Science and Technology. - : IOP Publishing. - 2058-9565. ; 7:3
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Cavity quantum optomechanics has emerged as a new platform for quantum science and technology with applications ranging from quantum-information processing to tests of the foundations of physics. Of crucial importance for optomechanics is the generation and verification of non-Gaussian states of motion and a key outstanding challenge is the observation of a canonical two-mode Schrodinger-cat state in the displacement of two mechanical oscillators. In this work, we introduce a pulsed approach that utilizes the nonlinearity of the radiation-pressure interaction combined with photon-counting measurements to generate this entangled non-Gaussian mechanical state, and, importantly, describe a protocol using subsequent pulsed interactions to verify the non-Gaussian entanglement generated. Our pulsed verification protocol allows quadrature moments of the two mechanical oscillators to be measured up to any finite order providing a toolset for experimental characterisation of bipartite mechanical quantum states and allowing a broad range of inseparability criteria to be evaluated. Key experimental factors, such as optical loss and open-system dynamics, are carefully analyzed and we show that the scheme is feasible with only minor improvements to current experiments that operate outside the resolved-sideband regime. Our scheme provides a new avenue for quantum experiments with entangled mechanical oscillators and offers significant potential for further research and development that utilizes such non-Gaussian states for quantum-information and sensing applications, and for studying the quantum-to-classical transition.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Keyword

quantum optics
quantum optomechanics
non-Gaussianity
quantum measurement
entanglement

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