Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1212.3713 · Nature Physics

Observation of micro–macro entanglement of light

Alexander I. Lvovsky, Roohollah Ghobadi, Aveek Chandra, Adarsh S. Prasad, Christoph Simon

Published Jul 19, 2013• 104 citations
arXivHTMLPDF
DOI
10.1038/nphys2682

Related papers

Displacement of entanglement back and forth between the micro and macro domains

Natalia Bruno, Anthony Martin, Pavel Sekatski +3 more

arXiv:1212.3710•Nature Physics•Jul 19, 2013•101 citations

Coarse Graining Makes It Hard to See Micro-Macro Entanglement

Sadegh Raeisi, Pavel Sekatski, Christoph Simon

Observing quantum effects such as superpositions and entanglement in macroscopic systems requires not only a system that is well protected against environmental decoherence, but also sufficient measurement precision. Motivated by recent experiments, we study the effects of coarse graining in photon number measurements on the observability of micro-macro entanglement that is created by greatly amplifying one photon from an entangled pair. We compare the results obtained for a unitary quantum cloner, which generates micro-macro entanglement, and for a measure-and-prepare cloner, which produces a separable micro-macro state. We show that the distance between the probability distributions of results for the two cloners approaches zero for a fixed moderate amount of coarse graining. Proving the presence of micro-macro entanglement therefore becomes progressively harder as the system size increases.

arXiv:1108.2065•Physical Review Letters•Dec 16, 2011•66 citations

Entanglement between light and matter

Bouwmeester

Conference on Lasers and Electro-Optics•Jan 1, 2004•0 citations

Generation of hybrid entanglement of light

Hyunseok Jeong, Alessandro Zavatta, Minsu Kang +5 more

arXiv:1309.6192•Nature Photonics•Jun 20, 2014•229 citations

Why it is hard to see Schroedinger's cat: micro-macro entanglement and coarse-graining

Sadegh Raeisi, Pavel Sekatski, Christoph Simon

Observing quantum effects such as superpositions and entanglement in macroscopic systems requires not only a system that is well protected against environmental decoherence, but also sufficient measurement precision. Motivated by recent experiments, we study the effects of coarse-graining in photon number measurements on the observability of micro-macro entanglement that is created by greatly amplifying one photon from an entangled pair. We compare the results obtained for a unitary quantum cloner, which generates micro-macro entanglement, and for a measure-and-prepare cloner, which produces a separable micro-macro state. We show that the distance between the probability distributions of results for the two cloners approaches zero for a fixed moderate amount of coarse-graining. Proving the presence of micro-macro entanglement therefore becomes progressively harder as the system size increases.

•Aug 9, 2011•0 citations

The optical quantum entanglement experiments

F. J. Duarte

Institute of Physics eBooks•Sep 1, 2022•0 citations
Observing quantum effects such as superpositions and entanglement in macroscopic systems requires not only a system that is well protected against environmental decoherence, but also sufficient measurement precision. Motivated by recent experiments, we study the effects of coarse graining in photon number measurements on the observability of micro-macro entanglement that is created by greatly amplifying one photon from an entangled pair. We compare the results obtained for a unitary quantum cloner, which generates micro-macro entanglement, and for a measure-and-prepare cloner, which produces a separable micro-macro state. We show that the distance between the probability distributions of results for the two cloners approaches zero for a fixed moderate amount of coarse graining. Proving the presence of micro-macro entanglement therefore becomes progressively harder as the system size increases.
Observing quantum effects such as superpositions and entanglement in macroscopic systems requires not only a system that is well protected against environmental decoherence, but also sufficient measurement precision. Motivated by recent experiments, we study the effects of coarse-graining in photon number measurements on the observability of micro-macro entanglement that is created by greatly amplifying one photon from an entangled pair. We compare the results obtained for a unitary quantum cloner, which generates micro-macro entanglement, and for a measure-and-prepare cloner, which produces a separable micro-macro state. We show that the distance between the probability distributions of results for the two cloners approaches zero for a fixed moderate amount of coarse-graining. Proving the presence of micro-macro entanglement therefore becomes progressively harder as the system size increases.