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Author Shcherbatenko, M. L.; Elezov, M. S.; Goltsman, G. N.; Sych, D. V. url  doi
openurl 
  Title Sub-shot-noise-limited fiber-optic quantum receiver Type Journal Article
  Year 2020 Publication (down) Phys. Rev. A Abbreviated Journal Phys. Rev. A  
  Volume 101 Issue 3 Pages 032306 (1 to 5)  
  Keywords SSPD mixer, SNSPD  
  Abstract We experimentally demonstrate a quantum receiver based on the Kennedy scheme for discrimination between two phase-modulated weak coherent states. The receiver is assembled entirely from standard fiber-optic elements and operates at a conventional telecom wavelength of 1.55 μm. The local oscillator and the signal are transmitted through different optical fibers, and the displaced signal is measured with a high-efficiency superconducting nanowire single-photon detector. We show the discrimination error rate is two times below that of a shot-noise-limited receiver with the same system detection efficiency.  
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  ISSN 2469-9926 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 1268  
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Author Callen, Herbert. B.; Welton, Theodore A. doi  openurl
  Title Irreversibility and generalized noise Type Journal Article
  Year 1951 Publication (down) Phys. Rev. Abbreviated Journal  
  Volume 83 Issue 1 Pages 34-40  
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  Publisher American Physical Society Place of Publication Editor  
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  Notes Approved no  
  Call Number Serial 214  
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Author Cooper, L. N. openurl 
  Title Bound electron pairs in a degenerate fermi gas Type Journal Article
  Year 1956 Publication (down) Phys. Rev. Abbreviated Journal Phys. Rev.  
  Volume 104 Issue 4 Pages 1189-1190  
  Keywords BCS  
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  Notes Approved no  
  Call Number Serial 899  
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Author Bardeen, J.; Cooper, L. N.; Schrieffer, J. R. openurl 
  Title Microscopic theory of superconductivity Type Journal Article
  Year 1957 Publication (down) Phys. Rev. Abbreviated Journal Phys. Rev.  
  Volume 106 Issue Pages 162-164  
  Keywords BCS  
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  Notes Approved no  
  Call Number Serial 900  
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Author Bardeen, J.; Cooper, L. N.; Schrieffer, J. R. openurl 
  Title Theory of superconductivity Type Journal Article
  Year 1957 Publication (down) Phys. Rev. Abbreviated Journal Phys. Rev.  
  Volume 108 Issue 5 Pages 1175-1204  
  Keywords BCS  
  Abstract A theory of superconductivity is presented, based on the fact that the interaction between electrons resulting from virtual exchange of phonons is attractive when the energy difference between the electrons states involved is less than the phonon energy, â„<8f>ω. It is favorable to form a superconducting phase when this attractive interaction dominates the repulsive screened Coulomb interaction. The normal phase is described by the Bloch individual-particle model. The ground state of a superconductor, formed from a linear combination of normal state configurations in which electrons are virtually excited in pairs of opposite spin and momentum, is lower in energy than the normal state by amount proportional to an average (â„<8f>ω)2, consistent with the isotope effect. A mutually orthogonal set of excited states in one-to-one correspondence with those of the normal phase is obtained by specifying occupation of certain Bloch states and by using the rest to form a linear combination of virtual pair configurations. The theory yields a second-order phase transition and a Meissner effect in the form suggested by Pippard. Calculated values of specific heats and penetration depths and their temperature variation are in good agreement with experiment. There is an energy gap for individual-particle excitations which decreases from about 3.5kTc at T=0°K to zero at Tc. Tables of matrix elements of single-particle operators between the excited-state superconducting wave functions, useful for perturbation expansions and calculations of transition probabilities, are given.  
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  Notes Approved no  
  Call Number Serial 901  
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