Experimental semi-device-independent certification of entangled measurements

Abstract

Certifying the entanglement of quantum states with Bell inequalities allows one to guarantee the security of quantum information protocols independently of imperfections in the measuring devices. Here we present a similar procedure for witnessing entangled measurements, which play a central role in many quantum information tasks. Our procedure is termed semi-device-independent, as it uses uncharacterized quantum preparations of fixed Hilbert space dimension. Using a photonic setup, we experimentally certify an entangled measurement using measurement statistics only. We also apply our techniques to certify unentangled but nevertheless inherently quantum measurements.

7 pages, 2 figures

References in corpus (6)

• Device-independent security of quantum cryptography against collective attacks
• Measuring measurement
• Semi-device-independent security of one-way quantum key distribution
• Real time demonstration of high bitrate quantum random number generation with coherent laser light
• Device-independent certification of entangled measurements
• Semi-device-independent bounds on entanglement

Cited by in corpus (5)

• Almost qudits in the prepare-and-measure scenario
• Self-testing nonlocality without entanglement
• A positive operator-valued measure for two-photon detection via sum-frequency generation
• Activation of entanglement in generalized entanglement swapping
• Communication scenario enables robust self-testing of n-party Greenberger-Horne-Zeilinger basis measurements