Spectral shaping of the biphoton state from multiplexed thermal atomic ensembles
arXiv:1905.09482 · doi:10.1088/1361-6455/ab7556
Abstract
We theoretically investigate the spectral property of a biphoton state from multiplexed thermal atomic ensembles. This biphoton state originates from the cascade emissions, which can be generated by two weak pump fields under four-wave mixing condition. Under this condition, a signal photon from the upper transition, chosen in a telecommunication bandwidth, can be generated along with a correlated idler photon from the lower infrared transition. We can spectrally shape the biphoton state by multiplexing the atomic ensembles with frequency-shifted emissions, where the entropy of entanglement can be analyzed via Schmidt decompositions. We find that this spectral entanglement increases when more vapor cells are multiplexed with correlated or anti-correlated signal and idler fields. The eigenvalues in Schmidt bases approach degenerate under this multiplexing scheme, and corresponding Schmidt numbers can be larger than the number of the multiplexed vapor cells, showing the enlarged entropy of entanglement and excess correlated modes in continuous frequency spaces. We also investigate the lowest entropy of entanglement allowed in the multiplexing scheme, which is preferential for generating a pure single photon source. This shows the potentiality to spectrally shape the biphoton source, where high-capacity spectral modes can be applied in long-distance quantum communication and multimode quantum information processing.
arXiv comment4 figures
References in corpus (42)
- Quantum Cryptography
- The Quantum Internet
- Quantum information with continuous variables
- Long-distance quantum communication with atomic ensembles and linear optics
- Entanglement of Orbital Angular Momentum States of Photons
- Storage of light in atomic vapor
- Quantum Entanglement of High Angular Momenta
- Satellite-relayed intercontinental quantum network
- Experimental high-dimensional two-photon entanglement and violations of generalised Bell inequalities
- The European Quantum Technologies Roadmap
- Multimode quantum memory based on atomic frequency combs
- Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
- Analysis and interpretation of high transverse entanglement in optical parametric down conversion
- 18-qubit entanglement with photon's three degrees of freedom
- Isolating and enhancing the emission of single erbium ions using a silicon nanophotonic cavity
- Multiplexed Memory-Insensitive Quantum Repeaters
- The cooperative Lamb shift in an atomic nanolayer
- Quantum entanglement of angular momentum states with quantum numbers up to 10010
- Frequency-encoded photonic qubits for scalable quantum information processing
- Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonics
- Trapping ultracold dysprosium: a highly magnetic gas for dipolar physics
- Telecommunication-wavelength solid-state memory at the single photon level
- High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion
- Entanglement quantification and purification in continuous variable systems
- Quantum telecommunication based on atomic cascade transitions
- Telecommunications-band heralded single photons from a silicon nanophotonic chip
- Quantum frequency conversion to telecom of single photons from a nitrogen-vacancy center in diamond
- Shaping frequency entangled qudits
- Einstein-Podolsky-Rosen paradox in twin images
- High quality anti-relaxation coating material for alkali atom vapor cells
- Long-distance single photon transmission from a trapped ion via quantum frequency conversion
- Correlated photon pairs generated from a warm atomic ensemble
- Quantum optics experiments to the International Space Station ISS: a proposal
- Near-unity indistinguishability single photon source for large-scale integrated quantum optics
- High capacity spatial multimode quantum memories based on atomic ensembles
- Scalable photonic network architecture based on motional averaging in room temperature gas
- Efficiency of light-frequency conversion in an atomic ensemble
- Positive-P phase space method simulation in superradiant emission from a cascade atomic ensemble
- Atomic quantum memory for multimode frequency combs
- Cascaded cold atomic ensembles in a diamond configuration as a spectrally entangled multiphoton source
- Spectral Shaping of Cascade Emissions from Multiplexed Cold Atomic Ensembles
- Spectrally entangled biphoton state of cascade emissions from a Doppler-broadened atomic ensemble