Schrödinger's Cat: Where Does The Entanglement Come From?

Abstract

Schrödinger's cat is one of the most striking paradoxes of quantum mechanics that reveals the counterintuitive aspects of the microscopic world. Here, I discuss the paradox in the framework of quantum information. Using a quantum networks formalism, I analyse the information flow between the atom and the cat. This reveals that the atom and the cat are connected only through a classical information channel: the detector clicks → the poison is released → the cat is killed. No amount of local operations and classical communication can entangle the atom and the cat, which are initially in a separable state. This casts a new light on the paradox. Quanta 2017; 6: 57-60.

Classical and quantum geometric information flows and entanglement of relativistic mechanical systems

“…where the integral is considered for canonical mechanical variables and the corresponding functional dependence is determined by g(τ ). 4 With respect to general frames (or with necessary (3+1)+(3+1) decomposition and a d-metric of type (9)), the integration measure can be re-defined in a form which allows us to consider…”

“…Because of computational accessibility, the entanglement entropy plays a particulary important role together with Rényi entropies, mutual information etc. For recent reviews of most important ideas and results related to quantum information theory, we cite [1,2,3,4,5,6,7,8,9] and references therein. Here we note that the concept of entanglement entropy originated from quantum information theory [10].…”