Search results
Results from the WOW.Com Content Network
The concept of quantum illumination was introduced by Seth Lloyd and collaborators at MIT in 2008. This included a discrete-variable version [2] and a continuous-variable version developed in collaboration with Jeffrey Shapiro, Stefano Pirandola, Saikat Guha and others, [3] the latter version being based on Gaussian states. [4]
For the waveguide systems, the atom-light coupling and the squeezing effect can be enhanced using the evanescent field near to the waveguides, and the type of atom-light interaction can be controlled by choosing a proper polarization state of the guided input light, the internal state subspace of the atoms and the geometry of the trapping shape.
The regimes are defined by the relationship between the variance and average number of photon counts for the corresponding distribution. Both Poissonian and super-Poissonian light can be described by a semi-classical theory in which the light source is modeled as an electromagnetic wave and the atom is modeled according to quantum mechanics.
Finally, a squeezed vacuum state has also a zero mean electric field but a phase-dependent uncertainty (e). Generally, quantum uncertainty reveals itself through a large number of identical measurements on identical quantum objects (here: modes of light) that, however, give different results. Let us again consider a continuous-wave ...
These states, expressed as eigenvectors of the lowering operator and forming an overcomplete family, were introduced in the early papers of John R. Klauder, e.g. [4] In the quantum theory of light (quantum electrodynamics) and other bosonic quantum field theories, coherent states were introduced by the work of Roy J. Glauber in 1963 and are ...
The use of statistical mechanics is fundamental to the concepts of quantum optics: light is described in terms of field operators for creation and annihilation of photons—i.e. in the language of quantum electrodynamics. A frequently encountered state of the light field is the coherent state, as introduced by E.C. George Sudarshan in 1960.
Similarly, quantum states consist of sets of dynamical variables that evolve under equations of motion. However, the values derived from quantum states are complex numbers, quantized, limited by uncertainty relations, [1]: 159 and only provide a probability distribution for the outcomes for a system. These constraints alter the nature of ...
In atomic physics, a dark state refers to a state of an atom or molecule that cannot absorb (or emit) photons. All atoms and molecules are described by quantum states; different states can have different energies and a system can make a transition from one energy level to another by emitting or absorbing one or more photons.