Conditional nonclassical field generation in cavity QED

Abstract

We introduce a method for the conditional generation of nonclassical states of light in a cavity. We consider two-level atoms traveling along the transverse direction to the cavity axis and show that by conditioning on one of the output measurements nonclassical field states are generated. The two-level atoms are prepared in the ground state and we conditioned on the events in which they are also detected in the ground state. Nonclassical properties of the cavity mode are identified and characterized. This includes: quadrature squeezing, sub-Poissonian photon-number distributions, and negative Wigner functions. We determine the optimal parameter regions where the corresponding nonclassical features are most distinct. * elizabeth.agudelo@oeaw.ac.at † martin.bohmann@ino.it [22][23][24][25], squeezed states [26], or superposition states such as Schrödinger-cat state [27,28].

Non-equilibrium scalar field dynamics starting from Fock states: Absence of thermalization in one dimensional phonons coupled to fermions

“…Several problems in non-equilibrium dynamics relevant to different branches of physics require the description of dynamics of scalar fields starting from athermal initial conditions. Such initial conditions can result from sophisticated pulse-shaping techniques creating squeezed lights in optical cavities 39,44,45 . They can also be created when large amount of energy is dumped into a system with broken symmetry as is done in the case of pump-probe experiments [29][30][31][32][70][71][72] .…”

“…Compared to the well developed equilibrium and ground state theory for scalar fields (including interacting field theories) [22][23][24] , the non-equilibrium dynamics of scalar fields are relatively less studied. While the primary motivation for study of non-equilibrium dynamics of scalar fields were earlier related to studies of non-equilibrium processes in the early universe and in high energy collisions [25][26][27][28] , more recent advances in creating non-equilibrium states, either by pumping solid state systems with intense energy sources [29][30][31][32] , or by pulse shaping [33][34][35][36][37] and cavity engineering [38][39][40][41] , has led to a renewed focus on this topic. In many of these cases, the system evolves starting from an athermal state.…”

“…In many of these cases, the system evolves starting from an athermal state. A typical example is a cavity where the photons are initiated to a squeezed state 39,[42][43][44][45] . Thus it is very important to obtain a description of dynamics of scalar fields starting from athermal initial conditions.…”

Controllable Nonclassical Correlation by an Incoherent Pumping Field in a Λ‐Type Atom‐Cavity System

“…Moreover, the photon‐number distributions have been changed by a coherent control field in a cavity‐QED system, [ 18 ] which leads to the realization of coherent controlling on the generation, propagation, and absorption of light at quantum level. [ 19 ] Therefore, the cavity QED system provides an ideal platform for the generation of the quantum property of light and other nonclassical effects, such as sub‐Possonian photon statistics, [ 20,21 ] photon‐number states, [ 22 ] squeezed field, [ 23 ] and quantum jumps. [ 24 ] However, it is inevitable that decoherence occurs as a result of the quantum system interacting with an external environment.…”

Ultrafast modulation of vibrational polaritons for controlling the quantum field statistics at mid-infrared frequencies

“…Quantum light sources are key to the success of optical quantum technologies [1]. In the visible spectral range, several mechanisms are available to produce quantum light, such as single photon emission by atoms in optical resonators [2,3], photon blockade in cavity optomechanics [4], or ensemble strong coupling with atomic emitters [5]. In the near infrared (0.7 − 2.5 µm), quantum light generation is a mature technology that has become the workhorse for applications in quantum communication [6,7] and sensing [8,9].…”