Storage of polarization-entangled THz-bandwidth photons in a diamond quantum memory

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DOIResolve DOI: http://doi.org/10.1103/PhysRevA.96.012324
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TypeArticle
Journal titlePhysical Review A
ISSN2469-9926
2469-9934
Volume96
Issue1
Article number012324
AbstractBulk diamond phonons have been shown to be a versatile platform for the generation, storage, and manipulation of high-bandwidth quantum states of light. Here we demonstrate a diamond quantum memory that stores, and releases on demand, an arbitrarily polarized ∼250 fs duration photonic qubit. The single-mode nature of the memory is overcome by mapping the two degrees of polarization of the qubit, via Raman transitions, onto two spatially distinct optical phonon modes located in the same diamond crystal. The two modes are coherently recombined upon retrieval and quantum process tomography confirms that the memory faithfully reproduces the input state with average fidelity 0.784±0.004 with a total memory efficiency of (0.76±0.03)%. In an additional demonstration, one photon of a polarization-entangled pair is stored in the memory. We report that entanglement persists in the retrieved state for up to 1.3 ps of storage time. These results demonstrate that the diamond phonon platform can be used in concert with polarization qubits, a key requirement for polarization-encoded photonic processing.
Publication date
PublisherAmerican Physical Society
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number23002140
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Record identifiera7783d7a-5b35-421d-8f24-e30c41eeacbb
Record created2017-08-25
Record modified2017-08-25
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