1 / 9

Introduction

Introduction. The Quantum World. The “Schrödinger’s Cat” Experiment (1935). The cat is isolated from the environment. The state of the cat is entangled to the one of a typical quantum system : an atom !. “alive”. “dead”. The Quantum World. AND ?.

palma
Download Presentation

Introduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction

  2. The Quantum World The “Schrödinger’s Cat” Experiment (1935) The cat is isolated from the environment The state of the cat is entangled to the one of a typical quantum system : an atom !

  3. “alive” “dead” The Quantum World AND ? • The cat is actually a detector of the atom’s state • Result “dead” : the atom is disintegrated • Result “alive” : the atom is excited Entanglement

  4. “alive” “dead” The Quantum World AND ? OR ! Quantum Decoherence : Interaction with the environment leads to a transition into a more classical behavior, in agreement with the common intuition!

  5. The Quantum World • Measurement Postulate • The state of the measured system, just after a measurement, is the state in which we measure the system. • Before the measurement : the system can be in a superposition of different states. One can only make predictions about measurement results. • After the measurement : Update of the state provided by the measurement … • Measurement Problem ?

  6. Amplification of Vital Signs The Wigner’s Friend Effects of an observation ?

  7. Wigner representation of the POVM element describing the perception of light Quantum state retrodicted from the light perception Quantum properties of Human Eyes

  8. Effects of an observation Quantum state of the cat (C), the light (D) and the atom (N) State conditioned on the light perception Quantum decoherence induced by the observation

  9. Interests of a non-classical measurement Let us imagine a detector of “Schrödinger’s Cat” states of light Effects of this measurement (projection postulate) “AND” Quantum coherences are preserved !

More Related