Squeezing as an irreducible resource

Journal Article · Sun May 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.055801· OSTI ID:20717832

Braunstein, Samuel L ^[1]

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1. Computer Science, University of York, York YO10 5DD (United Kingdom)

Using the Bloch-Messiah reduction we show that squeezing is an 'irreducible' resource which remains invariant under transformations by linear optical elements. In particular, this gives a decomposition of any optical circuit with linear input-output relations into a linear multiport interferometer followed by a unique set of single-mode squeezers and then another multiport interferometer. Using this decomposition we derive a no-go theorem for creating superpositions of macroscopically distinct states from single-photon detection. Further, we demonstrate the equivalence between several schemes for randomly creating polarization-entangled states. Finally, we derive minimal quantum optical circuits for ideal quantum nondemolition coupling of quadrature-phase amplitudes.

• OSTI ID: 20717832
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
COUPLING
DETECTION
INTERFEROMETERS
PHOTONS
POLARIZATION
QUADRATURES
QUANTUM ENTANGLEMENT
TRANSFORMATIONS