Super-resolving multi-photon interferences with independent light sources
 

We propose to use multi-photon interferences from statistically independent light sources in combination with linear optical detection techniques to enhance the resolution in imaging. Experimental results with up to five independent thermal light sources confirm this approach to improve the spatial resolution. Since no involved quantum state preparation or detection is required the experiment can be considered an extension of the Hanbury Brown and Twiss experiment for spatial intensity correlations of order N>2. [1]

 [1] S. Oppel, Th. Büttner, P. Kok, J. von Zanthier, Phys. Rev. Lett. 109.233603 (2012)  

 

 Sub-Rayleigh Quantum Imaging Using Single Photon Sources
 

We propose a technique capable of imaging a distinct physical object with sub-Rayleigh resolution in an ordinary far-field imaging setup using single-photon sources and linear optical tools only. We exemplify our method for the case of a rectangular aperture and two or four single-photon emitters obtaining a resolution enhanced by a factor of 2 or 4, respectively. [1]

 [1] C. Thiel, T. Bastin, J. von Zanthier, G. S. Agarwal, Phys. Rev. A 80, 013820 (2009) 

 

 Quantum Imaging with incoherent photons
 

We propose a technique to obtain subwavelength resolution in quantum imaging with potentially 100 % contrast using incoherent light. Our method requires neither path-entangled number states nor multiphoton absorption. The scheme makes use of N photons spontaneously emitted by N atoms and registered by N detectors. It is shown that for coincident detection at particular detector positions a resolution of λ/N can be achieved. [1]

 [1] C. Thiel, T. Bastin, J. Martin, E. Solano, J. von Zanthier, G. S. Agarwal, Phys. Rev. Lett. 99, 133603 (2007)