My Research

Research description

My research involves studies of quantum information scrambling in many-body systems. The scrambling of information essentially means that the information is spread across many system degrees of freedom through the generation of entanglement. The information is hidden from the local measurements but is never lost. The information scrambling is measured by using out-of-time ordered correlators, simply called as OTOCs.

We explore the nature of information scrambling in the context of different quantum systems. In our recent work, we used a two-spin model coupled via Hyperfine interaction with one of the spins being kicked at finite intervals of time (also called kicked coupled top). The kicked coupled top exhibits chaos in the classical limit and conserved total magnetization along \(Z\)- axis. We also developed a protocol to measure OTOCs using DQC-1 algorithm which gives exponential speed up over any other existing classical algorithm.

Publications

1. Pg, Sreeram, Naga Dileep Varikuti, and Vaibhav Madhok. "Exponential speedup in measuring out-of-time-ordered correlators and gate fidelity with a single bit of quantum information." \(\textit{Physics Letters A}\) 397 (2021): 127257

   Arxiv preprint : arXiv:2009.03415 [quant-ph]

2. Varikuti, N. D., & Madhok, V. (2022). Out-of-time ordered correlators in kicked coupled tops and the role of conserved quantities in information scrambling. arXiv preprint arXiv:2201.05789.