Coupling of four-wave mixing and Raman scattering by ground-state atomic coherence

Abstract

We demonstrate coupling of light resonant to transition between two excited states of rubidium and long-lived ground-state atomic coherence. In our proof-of-principle experiment a non-linear process of four-wave mixing is used to achieve light emission proportional to independently prepared ground-state atomic coherence. Strong correlations between stimulated Raman scattering light heralding generation of ground-state coherence and the four-wave mixing signal are measured and shown to survive the storage period, which is promising in terms of quantum memory applications. The process is characterized as a function of laser detunings.

Highly Stable Photonic Local Carriers for Phased Array Receiver System

“…Stabilization of laser frequency differences is essential in many modern experimental schemes. Applications extend from advanced optical fiber telecommunications in atomic clocks or in high resolution atomic and molecular spectroscopy [1][2][3][4] to precision spectroscopy and sensing [5,6]. Phase coherence of the two laser fields locked at a frequency offset is not required in many applications and a mere frequency lock is an adequate solution.…”

The Raspberry Pi Auto-aligner: Machine Learning for Automated Alignment of Laser Beams

“…This is particularly difficult in quantum optics experiments working at low light levels. Aligning the signal into the detector is more difficult in experiments with very low light levels-such as single-photon generation from hot thermal vapors [10][11][12][13][14][15][16][17][18][19][20]-that necessitate using fiber-coupled photon-detectors [21][22][23][24]. Because of these issues, we were strongly motivated to commission a device to automate beam alignment.…”

Generation of coherent mid-IR light by parametric four-wave mixing in alkali vapor

“…In particular, 4WM in alkali atoms is extensively used in various applications, including photon storage [3,4] and quantum memories [5], the generation of single-photon sources [6], correlated photon pairs [7], the creation of entangled images [8], or the transfer of trans-spectral orbital angular momentum [9], to name a few. 4WM in alkali atoms has been investigated in various energy level schemes, such as double lambda [10,11], double ladder [12,13], or diamond [14][15][16][17]; it was examined in a wide range of platforms, including hot vapors [18,19], cold atoms [20], and hollow-core photonic crystal fibers [21].…”