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Bulletin of the American Physical Society

Experimental Demonstration of Quantum Imaging by Coherent Enhancement

Robert McConnell, Colin Bruzewicz, Guang Hao Low, Theodore J. Yoder, John Chiaverini, Jeremy Sage, Isaac L. Chuang

Published May 25, 2016• 0 citations
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Quantum imaging utilizes the correlation of photons to enhance the security, covertness, and noise resilience of optical imaging. Despite recent advances, developing a quantum imaging system with long-distance and strong noise resilience remains challenging. Here, we present an experimental demonstration of high-performance quantum imaging at telecom band with enhanced noise resilience. We use a fiber-integrated quantum light source via cascaded second-order nonlinear processes to generate high-quality correlated/entangled photon pairs at telecom band and a fiber-coupled confocal optical system to effectively suppress the background noise and improve the collection efficiency of echo signal photons by optimizing its bandwidth and aperture. In our demonstration, the quantum imaging with correlated/entangled photon pairs or heralded single photons is achieved at a distance of 11 m under indoor illumination. When the detected environment noise is 33 dB stronger than the signal photons, corresponding to a coincidence-to-accidental coincidence ratio of 1.7 ± 0.1, an imaging contrast of 0.23 ± 0.09 is achieved, which is 46 times higher than single-photon imaging without correlation. The results will open venues for the development of practical quantum imaging techniques.
In our work, we focus on the experimental demonstration of two complementary approaches to enhancing the interaction between photons and atoms at the level of individual photons and 40Ca+ ions. We implement a scheme in which the observation of light interference scattered by several trapped atomic ions is further enhanced due to interference with their mirror images. The control of the corresponding collective coherent optical scattering and the possibility of observing the interaction with light emitted by many independent ions modified by optical boundary conditions promises a feasible approach to the effective realization of the interaction between light and matter or to the controlled observation of quantum electrodynamics phenomena with many atoms.