Experimental generation of Schrodinger cats via quantum measurement

S. T. Ho*, A. La Porta, R. E. Slusher, B. Yurke, A. S. Lane

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, S. Song et al. (1989) showed that the superposition of macroscopic quantum states, commonly referred to as Schrodinger cats, can be generated by quantum measurement. The apparatus and method they proposed are described. Two light beams, A and B, with nonclassical phase-quadrature correlations are first generated by a backaction evasion apparatus. Beam A is then detected by a photon counter, D, while beam B goes through a parametric amplifier and comes out as beam B'. S. Song et al. show that at B' one has a Schrodinger cat whose state is conditioned on the photon number nR counted by D. B. Yurke and D. Stoler (1986) showed that for the quantum signature of the interference fringes to exist, one can tolerate a loss of no more than one photon in beam A. Thus, to generate a cat with even nR = 3, one needs a detector capable of distinguishing three photons from two or four photons. This requires not only that the detector quantum efficiency be larger than 70% but also that the detector multiplication and dark-current noise be low. A photon counter satisfying all three criteria does not yet exist. It is proposed that the multiplication noise be reduced by subdividing A into many beams with 50-50 beam splitters. An example of seven beam splitters and eight detectors is shown and discussed.

Original languageEnglish (US)
Title of host publicationXVII International Conference on Quantum Electronics. Digest of
PublisherPubl by IEEE
Pages68-69
Number of pages2
StatePublished - Dec 1 1990
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990

Other

Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA
Period5/21/905/25/90

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Experimental generation of Schrodinger cats via quantum measurement'. Together they form a unique fingerprint.

  • Cite this

    Ho, S. T., La Porta, A., Slusher, R. E., Yurke, B., & Lane, A. S. (1990). Experimental generation of Schrodinger cats via quantum measurement. In XVII International Conference on Quantum Electronics. Digest of (pp. 68-69). Publ by IEEE.