Large time-asymmetric quantum fluctuations in amplitude–intensity correlation measurements of V-type three-level atom resonance fluorescence

Abstract

In this paper we show that the scattered field of a bichromatically driven V-type three-level atom exhibit asymmetry and large violation of classical bounds in amplitude-intensity correlations. These features result from the noncommutativity of amplitude and intensity field operators, and the strong non-Gaussian fluctuations in this system. The amplitude-intensity correlations of resonance fluorescence, with its large third-order fluctuations, describe the nonclassical features of the emitted field more accurately than the second-order measure related to squeezing. Spectra and variances of these correlations, along intensity-intensity correlations, provide a wealth of supporting information.PACS number(s): 42.50. Pq, 42.50.Lc, 42.50.Ct, arXiv:1706.03027v1 [quant-ph]

Phase-dependent fluctuations of resonance fluorescence near the coherent population trapping condition

“…In this regime the dipole α ea , indicative of the coherence induced by the laser, is small; most of the total emission is incoherent. This observation can be quantitatively revealed from the fact that h φ (0) = 0 (just as it occurs for photon correlations in resonance fluorescence), which leads to the relation [22] h…”

“…1: Scheme of the Λ three-level atom with spontaneous decay rates γa, γ b , interacting with lasers with Rabi frequencies Ωa, Ω b with detunings ∆a, ∆ b . asymmetry was readily observed for cavity QED systems both numerically [14,19] and experimentally [15], it has been the resonance fluorescence of several 3LA systems that have provided clear theoretical access to the understanding of the asymmetry [21][22][23][24][25][26]. More recent accounts of asymmetric correlations are found in plasmonics [27] and collective cavity QED [28].…”

“…where the second relation is derived for Gaussian fluctuations. More recently, it was found that light in a coherent state obeys [22]…”

“…In the experiment outlined in [11], squeezing, far from the two-photon detuning, was explored in the weak field regime. In keeping with the same spirit, quantum fluctuations of the light scattered by a coherently driven V-type 3LA have thoroughly been analyzed [22]. In this work, near the two-photon detuning, we investigate, within the framework of CHD, the adjoining effect of CPT on the phase-dependent quantum fluctuations of the emitted light of the probe transition of a Λ-3LA by amplitudeintensity correlations.…”

Probing intensity-field correlations of single-molecule surface-enhanced Raman-scattered light

“…This issue has been highlighted both theoretically [23,26] and experimentally [24] in the context of cavity QED systems and subsequently, also theoretically, in resonance fluorescence of a three level atom [37]. Still more recently, Castro-Beltrán et al [38][39][40][41] undertook a thorough analytical treatment of non-Gaussian fluctuations encountered in resonance fluorescence of two-and three-level atomic systems via intensity-field correlation measurements. Further context-dependent studies on the subject have also been reported, such as the light emitted from a two-level atom in an optical cavity [42,43], superconducting artificial atoms [44], fluorescence from optical transitions in Ξ-and V-type three-level atoms [45,46], and the experimental realization of the resonance fluorescence of a single trapped 138 Ba + ion [47].…”