Measurement-induced amplification of optical cat-like states

Amine Laghaout, Jonas Schou Neergaard-Nielsen, J. Rigas, Christian Kragh, Anders Tipsmark, Ulrik Lund Andersen

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Coherent state superpositions, also known as Schrödinger cat states, are widely recognized as promising resources in quantum information, quantum metrology, as well as fundamental tests. These states are hard to produce deterministically and most schemes for their probabilistic generation can only attain amplitudes too small for practical use. This is for example the case for photon-subtracted squeezed vacuum (PSSV), which can be used to approximate cat states of amplitude no larger than y = 1.5 if the fidelity is to be maintained above 95%. One way to reach larger amplitudes is to start with pairs of small cats and then to interfere them on a balanced beam splitter. The projective measurement of one of the outputs is used to herald a larger cat resulting from the constructive interference of the initial states. The scheme proposed here uses the projection |x = 0〉〈x = 0| as the heralding condition. Homodyning is proposed, as opposed to photon counting, because homodyne detection has high a quantum efficiency, and - as demonstrated in the paper - can be tuned to increase the success probability of the amplification without heavily compromising the output's fidelity.
Original languageEnglish
Title of host publicationProceedings of Conference on Lasers and Electro-Optics Europe (CLEO EUROPE) and International Quantum Electronics Conference
Number of pages1
Publication date2013
ISBN (Print)978-1-4799-0593-5
Publication statusPublished - 2013
EventConference on Lasers and Electro-Optics Europe 2013 (CLEO Europe): International Quantum Electronics Conference (IQEC) - Münich, Germany
Duration: 12 May 201316 May 2013


ConferenceConference on Lasers and Electro-Optics Europe 2013 (CLEO Europe)


  • amplification
  • homodyne detection
  • light coherence
  • light interference
  • optical beam splitters
  • optical squeezing
  • Aerospace
  • Bioengineering
  • Communication, Networking and Broadcast Technologies
  • Components, Circuits, Devices and Systems
  • Engineered Materials, Dielectrics and Plasmas
  • Engineering Profession
  • Fields, Waves and Electromagnetics
  • General Topics for Engineers
  • Nuclear Engineering
  • Photonics and Electrooptics
  • Power, Energy and Industry Applications
  • balanced beam splitter
  • Cats
  • coherent state superpositions
  • constructive interference
  • homodyning
  • measurement-induced amplification
  • optical cat-like states
  • Optical variables measurement
  • Optimized production technology
  • photon-subtracted squeezed vacuum
  • Photonics
  • PSSV
  • quantum efficiency
  • quantum information
  • Quantum mechanics
  • quantum metrology
  • Schrödinger cat states
  • Stimulated emission


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