Quantum coherence8/2/2023 ![]() A consistent evaluation of different threshold indicators provides a tool for a correct interpretation of experimental measurements at the onset of laser action. It also paves the way to the newly emerging field of quantum thermodynamics that aims create a bridge between thermodynamics and quantum mechanics. Our predictions are in remarkable agreement with experiments whose first-order coherence measurements have so far been explained only phenomenologically. Quantum plasmonics experiments have on multiple occasions resulted in the observation of quantum coherence of discrete plasmons, which exhibit remarkable preservation of quantum interference visibility, a seemingly surprising feature for systems mixing light and matter with high Ohmic losses during propagation. Quantum coherence lies at the heart of many nonintuitive quantum phenomena and is arguably the key ingredient responsible for the second quantum revolution of the 21st century. The transition toward coherent emission becomes increasingly sharp as the numbers of emitters and coupled electromagnetic cavity modes increase, continuously connecting, in the thermodynamic limit, the physics of nano- and macroscopic lasers at threshold. The first-order coherence g ( 1 ) steadily increases, as the pump grows towards the laser threshold value, and reaches unity at or beyond threshold. The growth in photon number in the lasing mode is driven by an increase in correlation between absorption and emission processes, leading to the onset of self-sustained stimulated emission (laser threshold), followed in turn by a correlation decrease and ending with the dominance of coherent emission. Gaussian ensembles.We detail the derivation of nanolaser models that include coherent and incoherent variables and predict the existence of a laser threshold, irrespective of cavity size and emitter number, for both single- and multielectron systems. Theory, we analytically characterize the CGP-OTOC connection for the Haar and Recurrences in quantitatively the same way. Transverse-field Ising model, we show that the OTOC and CGP capture quantum Via numerical simulations of the (nonintegrable) ![]() In this Colloquium we discuss and review the development of this rapidly growing research eld that encompasses the characterization, quantication, manipulation, dynamical evolution, and operational application of quantum coherence. Out-of-time-ordered correlator (OTOC), a measure of information scrambling in of quantum coherence as a physical resource has only been initiated recently. That the coherence-generating power (CGP) - a measure of how much coherence aĭynamical process generates on average - emerges as a subpart of the In fact, quantum coherence is related to the bodys ability to enable photons to work synergistically and collaboratively to organize biological processes. Matrix theory in the bulk of the spectrum. Then, we numerically study the coherence ofĬhaotic-vs-integrable eigenstates and find excellent agreement with random Coherence was originally conceived in connection with Thomas Young 's double-slit experiment in optics but is now used in any field that involves waves, such as acoustics, electrical engineering, neuroscience, and quantum mechanics. This connection for all quantum coherence measures by using tools from Quantum coherence measures in disguise (or closely related to them). States, we show how several well-studied quantifiers of chaos are, in fact, We quantify this connectionĪt two different levels: quantum states and quantum channels. Quantum coherence is a prime resource in quantum computing and quantum communication. Download a PDF of the paper titled Quantum coherence as a signature of chaos, by Namit Anand and 3 other authors Download PDF Abstract: We establish a rigorous connection between quantum coherence and quantumĬhaos by employing coherence measures originating from the resource theoryįramework as a diagnostic tool for quantum chaos.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |