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Optics Communications

Erasing nonlocal like two photon interference

C. Olindo, M. A. Sagioro, Sebastião Pádua, Carlos Henrique Monken

Published Sep 7, 2015• 2 citations
Publisher
DOI
10.1016/j.optcom.2015.08.091

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We report a random delayed-choice quantum eraser experiment. In a Young's double-slit interferometer, the which-slit information is learned from the photon-number fluctuation correlation of thermal light. The reappeared interference indicates that the which-slit information of a photon, or wave packet, can be "erased" by a second photon or wave packet, even after the annihilation of the first. Different from an entangled photon pair, the jointly measured two photons, or wave packets, are just two randomly distributed and randomly created photons of a thermal source that fall into the coincidence time window. The experimental observation can be explained as a nonlocal interference phenomenon in which a random photon or wave packet pair, interferes with the pair itself at distance.
Quantum nonlocality is explored in a proposed experiment simpler than most in that only one photon is detected and no polarizations are measured. A pair of multilevel atoms is irradiated by a weak tuned laser pulse, exciting a certain level in one of them that subsequently decays to a metastable level, emitting a photon. The photon is detected on a distant screen, producing an interference pattern. In the delayed-choice option a second tuned laser pulse that indirectly deexcites the metastable level is sent in later, but while the photon is in flight toward the screen. The interference pattern is found to be erased. A feature is that this ``memory erasure'' is partial, and its degree is controlled by varying the distance between the pair of atoms.
Abstract Wave–particle duality is a counterintuitive nature of quantum physics that challenges many common-sense assumptions, and Young’s double-slit interference is a prototypical example. While most quantum erasure experiments emphasized the choice of erasing or marking the which-path information of one quantum system, we use frequency entanglement to report a nonlocal temporal double-slit interferometer such that the which-time information determines the wave-like or particle-like behaviors. Since frequency-entangled photons are created simultaneously by using spontaneous parametric down conversion, the mark of temporal distinguishability is readily prepared by delaying one of the entangled photons, and its quantum eraser is implemented by using spectrally resolved detection with a tunable delayed choice. These results may provide an alternative aspect and insight into the role of the temporal degree in quantum-light complementarity and photon interference.