Characterization of Gaussian operations and distillation of Gaussian states
Geza Giedke,J. Ignacio Cirac +1 more
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TLDR
It is shown that Gaussian states cannot be distilled by local Gaussian operations and classical communication, and positive (but not completely positive) Gaussian maps are defined.Abstract:
We characterize the class of all physical operations that transform Gaussian states to Gaussian states. We show that this class coincides with that of all operations that can be performed on Gaussian states using linear optical elements and homodyne measurements. For bipartite systems we characterize the processes that can be implemented by local operations and classical communication, as well as those that can be implemented using positive partial transpose preserving maps. As an application, we show that Gaussian states cannot be distilled by local Gaussian operations and classical communication. We also define and characterize positive (but not completely positive) Gaussian maps.read more
Citations
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Capacity of optical transmission with attenuation and amplification
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Entanglement enhancement in multimode integrated circuits
TL;DR: In this article, a multimodal extension to the enhancement via photon subtraction protocol is studied, and the authors show that the gain in entanglement is not monotonic with the number of modes or the degree of squeezing in the additional modes.
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Fundamental limits on concentrating and preserving tensorized quantum resources
TL;DR: In this article , the authors investigate the manipulation of quantum resources possessing the so-called tensorization property and identify the fundamental limitations on concentrating and preserving those quantum resources, and they show that if a resource measure satisfies the tensorisation property as well as the monotonicity, it is impossible to concentrate multiple noisy copies into a single better resource by free operations.
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Non-Gaussianity as a signature of a quantum theory of gravity
Richard Howl,Richard Howl,Richard Howl,Vlatko Vedral,Vlatko Vedral,Devang Naik,Marios Christodoulou,Marios Christodoulou,Carlo Rovelli,Carlo Rovelli,Carlo Rovelli,Aditya Iyer +11 more
TL;DR: In this paper, it was shown that only a quantum, not classical, theory of gravity can create non-Gaussianity, a QIS resource that is necessary for universal quantum computation, in the quantum field state of matter.
The “Squeeze Laser”
TL;DR: In this article , the authors presented a continuous-wave 1550-nm "squeeze laser" with a footprint of 80 × 80 cm and the well-defined output beam has an interference contrast of 99% with an overlapped 10mW beam being in an almost perfect TEM00 mode.
References
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Book
Matrix Analysis
Roger A. Horn,Charles R. Johnson +1 more
TL;DR: In this article, the authors present results of both classic and recent matrix analyses using canonical forms as a unifying theme, and demonstrate their importance in a variety of applications, such as linear algebra and matrix theory.
Measuring the Quantum State of Light
TL;DR: In this paper, the authors present a method for simultaneous measurement of position and momentum in a simple optical instrument with respect to the quantum theory of light and quasiprobability distribution.
Book
Measuring the Quantum State of Light
TL;DR: In this paper, the authors present a method for simultaneous measurement of position and momentum in a simple optical instrument with respect to the quantum theory of light and quasiprobability distribution.
Journal ArticleDOI
Generalized Coherent States
TL;DR: In this paper, the generalized coherent states were studied using an operator technique similar to one we have used in a previous paper, and an alternative derivation of the most general coherent state was provided.