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Applied Physics Letters

Acoustic ghost diffraction

Hiroka Otomo, Ryota Keyaki, S. Fukatsu

Published Jul 14, 2025• 1 citation
Publisher

Abstract

An attempt is made to implement acoustic ghost diffraction in the space-momentum domain using ultrasound. The Hanbury Brown—Twiss effect helps ghost diffraction—interference fringes hidden in a large backdrop of first-order fringes to materialize only after making the two emitters mutually incoherent in a post-selective manner, which is leveraged by programmed decoherence. Cross correlation of phononic coherent states is taken in a reciprocal two-slit diffraction geometry so that nontrivial fringes due to virtual one-phonon diffraction—interference fringes emulated by two phonons emerge on the side of the transmitter as opposed to the receiver.

DOI
10.1063/5.0268818

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An attempt is made to implement acoustic ghost diffraction in the space-momentum domain using ultrasound. The Hanbury Brown—Twiss effect helps ghost diffraction—interference fringes hidden in a large backdrop of first-order fringes to materialize only after making the two emitters mutually incoherent in a post-selective manner, which is leveraged by programmed decoherence. Cross correlation of phononic coherent states is taken in a reciprocal two-slit diffraction geometry so that nontrivial fringes due to virtual one-phonon diffraction—interference fringes emulated by two phonons emerge on the side of the transmitter as opposed to the receiver.
Temporal ghost diffraction (TGD) is observed by taking two-photon cross-correlation in the configuration of reciprocal two-slit diffraction (2SD) where interference fringes develop on the light source side as opposed to the detector side. To this end, a narrow-band chaotic light source and a gated detector are used in the frequency-time domain, which emulate a randomly pointing incoherent light source and a stationary pinhole detector in the momentum-space domain, respectively. Spectral fringes with visibility that closely follows a sinc function of spectral bandwidth are clear evidence that legitimate TGD fringes due to two-photon interference develop even with classical light.
We compare the Hanbury Brown--Twiss (HBT) and the thermal light ghost imaging schemes in both near and far fields. Both effects arise as a result of the intensity fluctuations of the thermal light and we find that the essential physics behind the two effects is the same. The difference however is that, in the ghost imaging, large number of bits information of an object needs to be treated together, whereas, in the HBT, there is only one bit information required to be obtained. In the HBT experiment far field is used for the purpose of easy detection, while in the ghost image experiment near (or not far) field is used for good quality image.