Complexity and Control in Quantum Photonics by Peter Shadbolt

Author:Peter Shadbolt
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

If the photon passed through both holes simultaneously, as if it were a wave, then it stands to reason that we could detect it at both holes simultaneously, which never occurs.

If the photon does not pass through either hole, then we would never detect it at all—but we do.

So, the photon does not pass through hole A nor hole B alone, and it does not pass through both holes simultaneously, and it does not pass through neither hole—but it nevertheless arrives at the screen! In this experiment, the photon exhibits wave-particle duality, seemingly travelling and arriving as a lump, as if it were a particle, but simultaneously exhibiting wave interference—phenomena which are classically mutually exclusive. Contained in this experiment is the full mystery of quantum mechanics.

An optical implementation of Young’s double slit experiment was performed in 1909 by Sir Geoffrey Taylor, who used a gas flame together with smoked glass1 to generate “feeble light”, and observed interference fringes in the shadow cast by a sewing needle [4]. In 1961, the experiment was first performed using electrons [5]. More recent experimental results include double-slit interference of Buckminsterfullerene [3], and an electron interference experiment using micromachined slits [6] which could be opened and closed at will.

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