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Top-performance sources of photonic entanglement are an indispensableresource for many applications in quantum communication, most notably quantumkey distribution. However, up to now, no source has been shown tosimultaneously exhibit the high pair-creation rate, broad bandwidth, excellentstate fidelity, and low intrinsic loss necessary for gigabit secure key rates.In this work, we present for the first time a source of polarization-entangledphoton pairs at telecommunication wavelengths that covers all these needs ofreal-world quantum-cryptographic applications, thus enabling unprecedentedquantum-secure key rates of more than 1 Gbit/s. Our source is designed tooptimally exploit state-of-the-art telecommunication equipment and detectionsystems. Any technological improvement of the latter would result in an evenhigher rate without modification of the source. We discuss the usedwavelength-multiplexing approach, including its potential for multi-userquantum networks and its fundamental limitations. Our source paves the way forhigh-speed quantum encryption approaching present-day internet bandwidth.

Experimental entanglement generation for quantum key distribution beyond 1 Gbit/s