“The traditional optical techniques cannot resolve or write features smaller than half the wave length of light. This barrier, known as the diffraction limit, has important implications for a wide variety of research areas that utilize optical tools for example in microscopy and in recent times to quantum computing”, said Prof. G S Agarwal while delivering a Distinguished Lecture titled Quantum Coherence and Entanglement for Resolution on Nano Scale at the University of Hyderabad (UoH) on 4th January 2016. He further added that “We need to manipulate qubits to distances smaller than a wavelength in order to use large dipole dipole interaction at such distances. The diffraction limit prohibits this. A fast and reliable technique to address and manipulate qubits with nanometer resolution will have significant implications for quantum computing”.


Prof. G S Agarwal

Prof. G S Agarwal is Noble Foundation Chair and Regent Professor at the Department of Physics in Oklahoma State University, USA. Continuing with the powerful possibilities provided by quantum coherence, Prof. Agarwal discussed how such coherence created by two coherent laser beams can be used to achieve nano resolution in microscopy and localization. He also shared with the audience consisting of students, teachers and staff, on how the standard quantum limit can be beaten by using ideas of entanglement and new methods of detection.


Prof. Rajender Singh, Dean, School of Physics welcomed the gathering and introduced the speaker. Prof. Vipin Srivastava, In-charge Vice-Chancellor presided. Prof. Anantha Lakshmi, faculty in the School of Physics proposed the vote of Thanks.