Quantum mutual information of an entangled state propagating through a fast-light medium
arXiv:1405.7726 · doi:10.1038/nphoton.2014.112
Abstract
Although it is widely accepted that classical information cannot travel faster than the speed of light in vacuum, the behavior of quantum correlations and quantum information propagating through actively-pumped fast-light media has not been studied in detail. To investigate this behavior, we send one half of an entangled state of light through a gain-assisted fast-light medium and detect the remaining quantum correlations. We show that the quantum correlations can be advanced by a small fraction of the correlation time while the entanglement is preserved even in the presence of noise added by phase-insensitive gain. Additionally, although we observe an advance of the peak of the quantum mutual information between the modes, we find that the degradation of the mutual information due to the added noise appears to prevent an advancement of the leading edge. In contrast, we show that both the leading and trailing edges of the mutual information in a slow-light system can be significantly delayed.
References in corpus (7)
- Symplectic invariants, entropic measures and correlations of Gaussian states
- Wide-bandwidth, tunable, multiple-pulse-width optical delays using slow light in cesium vapor
- Maximal refraction and superluminal propagation in a gaseous nanolayer
- Stimulated generation of superluminal light pulses via four-wave mixing
- Advanced Quantum Noise
- Experimental characterization of Gaussian quantum discord generated by four-wave mixing
- Demonstration of images with negative group velocities
Cited by in corpus (16)
- Tunable fast and slow light in a hybrid optomechanical system
- Quantum-Enhanced Stimulated Brillouin Scattering Spectroscopy and Imaging
- Greatly enhanced intensity-difference squeezing for narrow-band quantum metrology applications
- Quantum networks generation based on four-wave mixing
- Squeezed Light Induced Two-photon Absorption Fluorescence of Fluorescein Biomarkers
- Observation of Spatial Quantum Correlations in the Macroscopic Regime
- Quantum Advantage with Seeded Squeezed Light for Absorption Measurement
- Harnessing quantum light for microscopic biomechanical imaging of cells and tissues
- Comparison of coherence area measurement techniques for bright entangled twin beams
- All-optical mode conversion via spatially-multimode four-wave mixing
- Causality and information transfer in simultaneously slow- and fast-light media
- Persistent Ballistic Entanglement Spreading with Optimal Control in Quantum Spin Chains
- Recovery of Quantum Correlations using Machine Learning
- Temporal Quantum Noise Reduction Acquired by an Electron-Multiplying Charge-Coupled-Device Camera
- Mitigating scattering in a quantum system using only an integrating sphere
- Theoretical analysis on quantum interference effect in fast-light media