5 papers · 1 filter
Quantum complexity and localization in random and time-periodic unitary circuits
Himanshu Sahu, Aranya Bhattacharya, Pingal Pratyush Nath
We study the growth and saturation of complexity in Krylov basis in random quantum circuits. In Haar-random unitary evolution, we show that, for large system sizes, this notion of…
Speed limits to the growth of Krylov complexity in open quantum systems
Aranya Bhattacharya, Pingal Pratyush Nath, Himanshu Sahu
Recently, the propagation of information through quantum many-body systems, developed to study quantum chaos, have found many application from black holes to disordered spin system…
Krylov complexity for non-local spin chains
Aranya Bhattacharya, Pingal Pratyush Nath, Himanshu Sahu
Building upon recent research in spin systems with non-local interactions, this study investigates operator growth using the Krylov complexity in different non-local versions of th…
Certified Random Number Generation using Quantum Computers
Pingal Pratyush Nath, Aninda Sinha, Urbasi Sinha
In recent decades, quantum technologies have made significant strides toward achieving quantum utility. However, practical applications are hindered by challenges related to scalin…
Single system based generation of certified randomness using Leggett-Garg inequality
Pingal Pratyush Nath, Debashis Saha, Dipankar Home +1
We theoretically formulate and experimentally demonstrate a secure scheme for semi-device-independent quantum random number generation by utilizing Leggett-Garg inequality violatio…