No-activation theorem for Gaussian nonclassical correlations by Gaussian operations
نویسندگان
چکیده
منابع مشابه
Quantum key distillation from Gaussian states by Gaussian operations.
We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with nonpositive partial transposition. Moreover, all such states allow for key distillation, when Eve is assumed to perform finite-s...
متن کاملNo-go theorem for gaussian quantum error correction.
We prove that Gaussian operations are of no use for protecting Gaussian states against Gaussian errors in quantum communication protocols. Specifically, we introduce a new quantity characterizing any single-mode Gaussian channel, called entanglement degradation, and show that it cannot decrease via Gaussian encoding and decoding operations only. The strength of this no-go theorem is illustrated...
متن کاملStrong No-Go Theorem for Gaussian Quantum Bit Commitment
Löıck Magnin, 2 Frédéric Magniez, Anthony Leverrier, and Nicolas J. Cerf 4 QuIC, École Polytechnique, CP 165, Université Libre de Bruxelles, 1050 Brussels, Belgium LRI, Univ Paris-Sud, CNRS; F-91405 Orsay, France Institut Telecom / Telecom ParisTech, CNRS LTCI, 46 rue Barrault, 75634 Paris Cedex 13, France Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Mas...
متن کاملDetecting nonclassical system-environment correlations by local operations.
We develop a general strategy for the detection of nonclassical system-environment correlations in the initial states of an open quantum system. The method employs a dephasing map which operates locally on the open system and leads to an experimentally accessible witness for genuine quantum correlations, measuring the Hilbert-Schmidt distance between pairs of open system states. We further deri...
متن کاملEstimation of nonclassical independent Gaussian processes by classical interferometry
We propose classical interferometry with low-intensity thermal radiation for the estimation of nonclassical independent Gaussian processes in material samples. We generally determine the mean square error of the phase-independent parameters of an unknown Gaussian process, considering a noisy source of radiation the phase of which is not locked to the pump of the process. We verify the sufficien...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review A
سال: 2014
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.90.022328