Computable measure of nonclassicality for light.

  title={Computable measure of nonclassicality for light.},
  author={J{\'a}nos K. Asb{\'o}th and John Calsamiglia and Helmut Ritsch},
  journal={Physical review letters},
  volume={94 17},
We propose the entanglement potential (EP) as a measure of nonclassicality for quantum states of a single-mode electromagnetic field. It is the amount of two-mode entanglement that can be generated from the field using linear optics, auxiliary classical states, and ideal photodetectors. The EP detects nonclassicality, has a direct physical interpretation, and can be computed efficiently. These three properties together make it stand out from previously proposed nonclassicality measures. We… 

Figures from this paper

Evaluating single-mode nonclassicality

Quantifying nonclassicality of a bosonic mode is an important but challenge task in quantum optics. Recently, the first nonclassicality measure based on the concept of operational resource theory has

A new nonclassicality measure for the quantum states of a bosonic field

We review a recently proposed measure of the nonclassicality of a bosonic field, based on the sensitivity of its quasi-probability distributions to ordering of the creation and annihilation

Relating the entanglement and optical nonclassicality of multimode states of a bosonic quantum field

The quantum nature of the state of a bosonic quantum field manifests itself in its entanglement, coherence, or optical nonclassicality which are each known to be resources for quantum computing or

Nonclassicality versus entanglement in a noncommutative space

Nonclassicality is an interesting property of light having applications in many different contexts of quantum optics, quantum information and computation. Nonclassical states produce substantial

Generating nonclassical states from classical radiation by subtraction measurements

We describe the creation of nonclassical states of microwave radiation via ideal dichotomic single photon detection, i.e., a detector that only indicates presence or absence of photons. Ideally, such

Generation of nonclassical states from thermal radiation

We show the experimental observation of quantum states of light exhibiting nonclassical features obtained by single photon excitation of a thermal state. Such single-photon-added thermal states are

Measuring Nonclassicality of Bosonic Field Quantum States via Operator Ordering Sensitivity.

A new distance-based measure for the nonclassicality of the states of a bosonic field, which outperforms the existing such measures in several ways and is analyzed with respect to a recently introduced quantum macroscopicity measure, showing how the two notions are distinct.

Demonstrating higher-order nonclassical effects by photon-added classical states: realistic schemes

Detecting nonclassical properties that do not allow classical interpretation of photoelectric counting events is one of the crucial themes in quantum optics. Observation of individual nonclassical

Entanglement and nonclassicality of photon-added two-mode squeezed thermal state

We introduce a kind of entangled state—a photon-addition two-mode squeezed thermal state (TMSTS)—by adding photons to each mode of the TMSTS. Using the P-representation of thermal state, the compact

Entanglement and nonclassicality for multimode radiation-field states

Nonclassicality in the sense of quantum optics is a prerequisite for entanglement in multimode radiation states. In this work we bring out the possibilities of passing from the former to the latter,



Quantifying nonclassicality of one-mode Gaussian states of the radiation field.

The closest classical Gaussian state and the degree of nonclassicality are found using a recently established expression for the Uhlmann fidelity of two single-mode Gaussian states and the decrease of non classicality under thermal mapping is analyzed.

Nonclassical distance in quantum optics.

  • Hillery
  • Physics
    Physical review. A, General physics
  • 1987
Methods are developed for estimating nonclassical distance and are applied to number states and squeezed states.

Distinguishability and nonclassicality of one-mode Gaussian states (10 pages)

The entropic amount of nonclassicality of aGaussian state defined as the minimal relative entropy of any classical Gaussian state with respect to it is analyzed and it is found that only the Bures-distance amount ofNon classicality is equivalent to the non classical depth.

Nonclassicality of States in Quantum Optics

The nearest Hilbert-Schmidt distance of (pure) states to coherent states is discussed as a quantitative measure of nonclassicality of states in quantum optics or quantum mechanics of harmonic

Entanglement by a beam splitter: Nonclassicality as a prerequisite for entanglement

A beam splitter is a simple, readily available device which can act to entangle output optical fields. We show that a necessary condition for the fields at the output of the beam splitter to be

Quantum-optical catalysis: generating nonclassical states of light by means of linear optics.

The single photon plays a role of a "catalyst:" it is explicitly present in both the input and the output channels of the interaction yet facilitates generation of a nonclassical state of light.

Coherent and incoherent states of the radiation field

Methods are developed for discussing the photon statistics of arbitrary radiation fields in fully quantummechanical terms. In order to keep the classical limit of quantum electrodynamics plainly in

Squeezed states with thermal noise. II. Damping and photon counting.

  • Marian
  • Physics
    Physical review. A, Atomic, molecular, and optical physics
  • 1993
The weak interaction of such a field with a heat bath of arbitrary temperature is shown to preserve the Gaussian form of the characteristic function, and simple analytic formulas for the counting distribution and its factorial moments are derived.