Cascaded cold atomic ensembles in a diamond configuration as a spectrally entangled multiphoton source

Abstract

We theoretically investigate the spectral entanglement of a multiphoton source generated from the cascade emissions in the cascaded cold atomic ensembles.\ This photon source is highly directional, guaranteed under the four-wave mixing condition, and is also highly frequency-correlated due to finite driving pulse durations and superradiant decay constants.\ We utilize Schmidt decomposition to study the bipartite entanglement of the biphoton states projected from the multiphoton ones.\ This entropy of entanglement can be manipulated by controlling the driving parameters and superradiant decay rates.\ Moreover the projected biphoton states in the cascaded scheme can have larger entanglement than the one produced from only one atomic ensemble, which results from larger capacity in multipartite entanglement.\ This cascaded scheme enables a multiphoton source useful in quantum information processing.\ It also allows for potential applications in multimode quantum communication and spectral shaping of high-dimensional continuous frequency entanglement.

6 figures

References in corpus (7)

• The Quantum Internet
• Multiphoton Quantum Optics and Quantum State Engineering
• Quantum Storage of Orbital Angular Momentum Entanglement in an Atomic Ensemble
• Einstein-Podolsky-Rosen paradox in twin images
• Efficient retrieval of a single excitation stored in an atomic ensemble
• Efficiency of light-frequency conversion in an atomic ensemble
• Spectral analysis for cascade-emission-based quantum communication in atomic ensembles

Cited by in corpus (8)

• Cooperative light scattering from helical-phase-imprinted atomic rings
• Collisional open quantum dynamics with a generally correlated environment: Exact solvability in tensor networks
• Almost indistinguishable single photons via multiplexing cascaded biphotons with cavity modulation and phase compensation
• Spectral compression and entanglement reduction in the cascaded biphoton state with cavities
• Superradiant parametric conversion of spin waves
• Spectrally entangled biphoton state of cascade emissions from a Doppler-broadened atomic ensemble
• Spectral shaping of the biphoton state from multiplexed thermal atomic ensembles
• Nonorthogonal coding in spectrally-entangled photons