Probing, Quantifying and Freezing Coherence in a Thermal Ensemble of Atoms
arXiv:1803.10169 · doi:10.1364/OPTICA.5.001462
Abstract
Creating stable superposed states of matter is one of the most intriguing aspects of quantum physics, leading to a variety of counter-intuitive scenarios along with a possibility of restructuring the way we understand, process and communicate information. Accordingly, there has been a major research thrust in understanding and quantifying such coherent superposed states. Here we propose and experimentally explore a quantifier that captures effective coherent superposition of states in an atomic ensemble at room-temperature. The quantifier provides a direct measure of ground state coherence for electromagnetically induced transparency (EIT) along with distinct signature of transition from EIT to Autler-Townes splitting (ATS) regime in the ensemble. Using the quantifier as an indicator, we further demonstrate a mechanism to coherently control and freeze coherence by introducing an active decay compensation channel. In the growing pursuit of quantum systems at room-temperature, our results provide a unique way to phenomenologically quantify and coherently control coherence in atom-like systems.
arXiv comment8 pages,4 figures along with supplementary information
References in corpus (32)
- Quantifying Coherence
- Quantum state transfer and entanglement distribution among distant nodes in a quantum network
- Storage of light in atomic vapor
- Quantum Coherence as a Resource
- Dark-State Polaritons in Electromagnetically Induced Transparency
- Measurement of conditional phase shifts for quantum logic
- Quantum interface between light and atomic ensembles
- The Electromagnetically Induced Transparency in Mechanical Effects of Light
- Mapping photonic entanglement into and out of a quantum memory
- What is- and what is not- Electromagnetically-Induced-Transparency in Whispering-Gallery-Microcavities
- Testing the limits of quantum mechanical superpositions
- Entanglement of Atomic Ensembles by Trapping Correlated Photon States
- Frozen Quantum Coherence
- Measuring multipartite entanglement via dynamic susceptibilities
- Interacting Dark Resonances: Interference Effects Induced by Coherently Altered Quantum Superpositions
- Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide
- Objectively discerning Autler-Townes Splitting from Electromagnetically Induced Transparency
- A Knob for Changing Light Propagation from Subluminal to Superluminal
- Entanglement of remote atomic qubits
- Narrowing of EIT resonance in a Doppler Broadened Medium
- Coherent resonant interactions and slow light with molecules confined in photonic band-gap fibers
- Nanophotonic coherent light-matter interfaces based on rare-earth-doped crystals
- Electromagnetically induced transparency controlled by a microwave field
- Deterministic single-photon source from a single ion
- Experimental Investigation of the Transition between Autler-Townes Splitting and Electromagnetically-Induced Transparency
- Environment-assisted quantum control of a solid-state spin via coherent dark states
- Steep optical wave group velocity reduction and storage of light without electromagnetically induced transparency
- Investigating macroscopic quantum superpositions and the quantum-to-classical transition by optical parametric amplification
- Polariton states in circuit QED for electromagnetically induced transparency
- Coherent Population Oscillation-Based Light Storage
- Quantum State Engineering using Single Nuclear Spin Qubit of Optically Manipulated Ytterbium Atom
- Interplay of classical and quantum dynamics in a thermal ensemble of atoms