Rising Above the Quantum Noise

Rising Above Principle

The Value of a Rose: Rising above Objectivism and Subjectivism

After my conclusion in the previous PrimaVera working paper that objectivism does not provide a firm theoretical foundation for information management, the question probed in this chapter is whether or not subjectivism can offer a convincing alternative basis. Ultimately, the answer is negative because subjectivists rarely specifically pay attention to what is the bottom line for private and, i...

Classical-quantum correspondence for above-threshold ionization.

We measure high resolution photoelectron angular distributions (PADs) for above-threshold ionization of xenon atoms in infrared laser fields. Based on the Ammosov-Delone-Krainov theory, we develop an intuitive quantum-trajectory Monte Carlo model encoded with Feynman's path-integral approach, in which the Coulomb effect on electron trajectories and interference patterns are fully considered. We...

Against Quantum Noise

This is a brief description of how to protect quantum states from dissipation and decoherence that arise due to uncontrolled interactions with the environment. We discuss recoherence and stabilisation of quantum states based on two techniques known as “symmetrisation” and “quantum error correction”. We illustrate our considerations with the most popular quantum-optical model of the system-envir...

Quantum Gaussian Noise

In semiclassical theory, light is a classical electromagnetic wave and the fundamental source of photodetection noise is the shot effect arising from the discreteness of the electron charge. In quantum theory, light is a quantum-mechanical entity and the fundamental source of photodetection noise comes from measuring the photon-flux operator. The Glauber coherent states are Gaussian quantum sta...