Enhancement of optical coherence in Er:YSiO crystal at sub-Kelvin temperatures
arXiv:1910.03096
Abstract
Er:YSiO crystal is a promising candidate with a great variety of its potential applications in quantum information processing and quantum communications ranging from optical/microwave quantum memories to circuit QED and microwave-to-optics frequency converters. Some of the above listed applications require ultra-low temperature environment, i.e., temperatures K. Most of the experiments with erbium doped crystals have been so far carried out at temperatures above 1.5~K. Therefore, only little information is known about Er:YSiO coherence properties at millikelvins. Here, we investigate optical decoherence of Er:YSiO crystal by performing 2- and 3-pulse echo experiments at millikelvin temperature range and at weak and moderate magnetic fields. We show that the deep freezing of the crystal results in an increase of optical coherence time by one order of magnitude compared to temperature of 1.5 Kelvin and magnetic field of 0.2~T, taken as a reference point. We further describe the detailed investigation of the decoherence mechanisms in this regime.
9 pages, 7 figures, 1 table, 47 references
References in corpus (7)
- Quenching Spin Decoherence in Diamond through Spin Bath Polarization
- Quantum storage of entangled telecom-wavelength photons in an erbium-doped optical fibre
- Anisotropic rare-earth spin ensemble strongly coupled to a superconducting resonator
- Cavity enhanced Raman heterodyne spectroscopy in Er:YSO for microwave to optical signal conversion
- Electron Spin Coherences in Rare-Earth Optically Excited States for Microwave to Optical Quantum Transducers
- Coherent spin dynamics of ytterbium ions in yttrium orthosilicate
- Electron Paramagnetic Resonance Spectroscopy of Er:YSiO Using Josephson Bifurcation Amplifier: Observation of Hyperfine and Quadrupole Structures