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We demonstrate an experimental method for measuring energy-time entanglementover almost 80 nm spectral bandwidth in a single shot with a quantum bit errorrate below 0.5%. Our scheme is extremely cost-effective and efficient in termsof resources as it employs only one source of entangled photons and one fixedunbalanced interferometer per phase-coded analysis basis. We show that themaximum analysis spectral bandwidth is obtained when the analysisinterferometers are properly unbalanced, a strategy which can bestraightforwardly applied to most of today's experiments based on energy-timeand time-bin entanglement. Our scheme has therefore a great potential forboosting bit rates and reducing the resource overhead of futureentanglement-based quantum key distribution systems.

Optimal analysis of ultra broadband energy-time entanglement for high bit-rate dense wavelength division multiplexed quantum networks