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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Effects

Q 12.5: Vortrag

Montag, 9. März 2020, 15:00–15:15, f442

Quantum light: wave or particle? — •Syamsundar De, Jan Sperling, Thomas Nitsche, Johannes Tiedau, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn — Integrated Quantum Optics, Paderborn University, Warburger Strasse 100, 33098 Paderborn, Germany

Wave-particle dualism is commonly interpreted as that the quantum objects exhibit either particle- or wave-like behavior. In this study, we challenge this usual notion of wave-particle duality by experimentally showing that neither the wave nor the particle picture can successfully describe our observations. We introduce correlation-based criteria that allow us to simultaneously and quantitatively assess wave and particle properties. It turns out that the measured correlations in our experiment using squeezed light are indeed incompatible with the predictions for waves and particles, simultaneously falsifying these two classical notions in a single quantum system. Besides, we establish a connection between our correlation-based criteria with the complementary notions of quantum coherence, linked with either the quantum-optical nonclassicality or the encoding capability of quantum information in particles. Additionally, we apply our methodology to certify the nonclassicality of coherent states, which are traditionally treated as classical light.