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Telecom C-Band Source of Triggered Polarization-Entangled Photon Pairs Combining High Coincidence Rates, Fidelities and Single-Photon Purity
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DOI：10.1002/qute.70317.png)
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Abstract
En 中文
Many protocols of future quantum networks rely on the availability of entangled qubits which enable links among remote nodes due to their unique properties. Therefore, the efficient generation of entangled photons constitutes a key goal toward the implementation of such quantum networks. However, currently available sources are bound by intrinsic limitations, as for instance probabilistic nature of emission. Deterministic quantum emitters pose a potential solution for this issue, however, the maturity of their device platforms still needs to be improved for truly on-demand emission. While record efficiencies are currently found at near-infrared wavelengths, sources at telecommunication wavelengths will likely be the ideal choice for quantum networks. That motivates the development of efficient sources of entangled photons in the telecom regime. This work addresses that challenge presenting a telecom C-band source of polarization entangled photons based on semiconductor quantum dots incorporated in a planar cavity structure. In this way, triggered emission of entangled photon pairs with a coincidence rate of (biexciton/exciton fiber-coupled single-photon count rates of / ) combined with values of / is achieved. Full quantum state tomography of the two-photon state demonstrates simultaneously entanglement fidelities of up to to the Bell state.
Keywords:
entanglement
quantum dots
telecom C-band
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