Research
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Title : | Broadband uniform-efficiency orbital angular momentum detectors for general one-photon and entangled two-photon states |
Area of research : | Physical Sciences |
Principal Investigator : | Dr. Anand Kumar Jha, Indian Institute Of Technology Kanpur (IITK), Uttar Pradesh |
Timeline Start Year : | 2023 |
Timeline End Year : | 2026 |
Contact info : | akjha[at]iitk[dot]ac[dot]in |
Equipments : | Geometric phase unit with automated rotation mount Image rotator with piezo/automated controller Computers Nonlinear crystals UV Laser Optomechanical stages and rotation mounts Spatial Light Modulator |
Details
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Executive Summary : | Quantum information applications based on the high-dimensional orbital angular momentum (OAM) basis offer numerous advantages over traditional two-dimensional protocols. OAM-based communication protocols have enhanced system capacities, better spectral efficiencies, larger transmission bandwidth, increased error tolerance, and improved security. They are also more efficient for gate implementation, possess inherent advantages for fundamental tests of quantum mechanics, enable enhanced sensitivity for quantum metrology, and are preferred for ground-to-satellite communications. However, the major challenge in implementing quantum information protocols based on OAM is the absence of a broadband uniform-efficiency OAM detector that works for a general quantum state. There are several approaches to measuring OAM, including using a spatial light modulator with a single-mode fiber, measuring the angular coherence function of a photon field, bypassing interferometric stability requirements, and measuring the OAM of photons for specific classes of states or states with very low OAM dimensionality. This project proposes a scheme based on interfering a state with a rotated version of itself in a Mach-Zehnder interferometer and detecting the angle-averaged intensity at one of the output ports as a function of the rotation of an image rotator placed in one of the arms of the interferometer. The project aims to design and experimentally demonstrate a high-precision image rotator, demonstrate a broadband uniform-efficiency OAM detector for a general photonic state, and design and demonstrate a broadband uniform-efficiency OAM detector for entangled two-photon fields produced by the nonlinear optical process of parametric down-conversion. |
Total Budget (INR): | 79,70,600 |
Organizations involved
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Implementing Agency : | Indian Institute Of Technology Kanpur (IITK), Uttar Pradesh |
Funding Agency : | Anusandhan National Rsearch Foundation (ANRF)/Science and Engineering Research Board (SERB) |
Source : | Anusandhan National Research Foundation/Science and Engineering Research Board (SERB), DST 2023-24 |