Wavelength-Multiplexed Quantum Networks with Ultrafast Frequency Combs

Abstract : Highly entangled quantum networks – cluster states – lie at the heart of recent approaches to quantum computing \cite{Nielsen2006,Lloyd2012}. Yet, the current approach for constructing optical quantum networks does so one node at a time \cite{Furusawa2008,Furusawa2009,Peng2012}, which lacks scalability. Here we demonstrate the \emph{single-step} fabrication of a multimode quantum network from the parametric downconversion of femtosecond frequency combs. Ultrafast pulse shaping \cite{weiner2000} is employed to characterize the comb's spectral entanglement \cite{vanLoock2003}. Each of the 511 possible bipartitions among ten spectral regions is shown to be entangled; furthermore, an eigenmode decomposition reveals that eight independent quantum channels \cite{Braunstein2005} (qumodes) are subsumed within the comb. This multicolor entanglement imports the classical concept of wavelength-division multiplexing (WDM) to the quantum domain by playing upon frequency entanglement as a means to elevate quantum channel capacity. The quantum frequency comb is easily addressable, robust with respect to decoherence, and scalable, which renders it a unique tool for quantum information.
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https://hal.archives-ouvertes.fr/hal-00840936
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Submitted on : Wednesday, July 3, 2013 - 3:18:14 PM
Last modification on : Thursday, March 21, 2019 - 2:16:27 PM
Long-term archiving on : Wednesday, April 5, 2017 - 7:00:21 AM

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  • HAL Id : hal-00840936, version 1
  • ARXIV : 1307.1216

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Jonathan Roslund, Renné Medeiros de Araujo, Shifeng Jiang, Claude Fabre, Nicolas Treps. Wavelength-Multiplexed Quantum Networks with Ultrafast Frequency Combs. 2013. ⟨hal-00840936⟩

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