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Is a single photon's wave front observable?

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journal contribution
posted on 16.12.2015, 11:33 by Alexandre ZagoskinAlexandre Zagoskin, Richard D. Wilson, Mark EverittMark Everitt, Sergey Savel'ev, Dmitry R. Gulevich, J. Allen, V.K. Dubrovich, E. Il'ichev
We propose a method of resolving a spatially coherent signal, which contains on average just a single photon, against the background of local noise at the same frequency. The method is based on detecting the signal simultaneously in several points more than a wavelength apart through the entangling interaction of the incoming photon with the quantum metamaterial sensor array. The interaction produces the spatially correlated quantum state of the sensor array, characterised by a collective observable (e.g., total magnetic moment), which is read out using a quantum nondemolition measurement. We show that the effects of local noise (e.g., fluctuations affecting the elements of the array) are suppressed relative to the signal from the spatially coherent field of the incoming photon as ~1√N, where N is the number of array elements. The realisation of this approach in the microwave range would be especially useful and is within the reach of current experimental techniques.



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ZAGOSKIN, A.M. al., 2013.Is a single photon's wave front observable? ArXiv:1211.4182.


© The Authors. Published by Nature Publishing Group


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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) licence. Full details of this licence are available at:

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This is a pre print of ZAGOSKIN, A.M. et al, 2013. Spatially resolved single photon detection with a quantum sensor array. Scientific Reports, 3, article 3464.





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