24 citations · 113 across the 20 of their papers we have counts for
20 papers
Two-Qubit Spin-Boson Model in the Strong Coupling Regime: Coherence, Non-Markovianity, and Quantum Thermodynamics
Hasan Mehdi Rizvi, Devvrat Tiwari, Subhashish Banerjee
We investigate the dynamics of a two-qubit open quantum system, in particular the two-qubit spin-boson model in the strong coupling regime, coupled to two thermal bosonic baths und…
Thermodynamics of an Open Two-Level Symmetric Quantum System
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee
For a subclass of a general symmetric Hamiltonian obeying anti-commutation relation with its conjugate, a Hermitian basis is found that spans the bi-orthonormal ener…
Finite-Bath Open Quantum Systems: Exact Dynamics
Devvrat Tiwari, Subhashish Banerjee
In this work, we introduce a method for deriving exact master equations from the dynamical map for finite open quantum systems coupled to (in)finite reservoirs, using the principle…
Collective Quantum Batteries and Charger-Battery Setup in Open Quantum Systems: Impact of Inter-Qubit Interactions, Dissipation, and Quantum Criticality
Mahima Yadav, Devvrat Tiwari, Subhashish Banerjee
Quantum batteries have emerged as promising platforms for exploring energy storage and transfer processes governed by quantum mechanical laws. In this work, we study three models o…
Interferometric and Bipartite OTOC for Non-Markovian Open Quantum Spin-Chains and Lipkin-Meshkov-Glick Model
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee
The information scrambling phenomena in an open quantum system modeled by Ising spin chains coupled to Lipkin-Meshkov-Glick (LMG) baths are observed via an interferometric method f…
Symmetric Two-Level Open Quantum Systems: Information Theoretic Facets
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee
The theory of a two-level -Hermitian Hamiltonian with symmetry is reviewed and extended to include open system dynamics. A first-principles derivation of the gene…
(Thermo-)dynamics of the spin-boson model in the weak coupling regime: Application as a quantum battery
Mahima Yadav, Devvrat Tiwari, Subhashish Banerjee
We investigate the spin-boson model's dynamical and thermodynamic features in the weak coupling regime using the weak coupling spin-boson (WCSB) and phase covariant (PC) master equ…
Quantum Chaos in Non-Markovian Open Quantum Systems: Interferometric OTOC, Loschmidt Echo and Commutator Operator Norm
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee
Out-of-time order correlators (OTOCs) are crucial tools for studying quantum chaos as they show distinct scrambling behavior for chaotic Hamiltonians. We calculate OTOC and analyze…
Quantum Thermal Analogs of Electric Circuits: A Universal Approach
Devvrat Tiwari, Samyadeb Bhattacharya, Subhashish Banerjee
In this work, we develop a panoramic schematic of quantum thermal analogs of electric circuits in the steady state regime. We establish the foundations of said premise by defining…
Quantum Thermodynamics of Open Quantum Systems: Nature of Thermal Fluctuations
Neha Pathania, Devvrat Tiwari, Subhashish Banerjee
We investigate the thermodynamic behavior of open quantum systems through the Hamiltonian of Mean Force, focusing on two models: a two-qubit system interacting with a thermal bath…
Quantum speed limit and nonclassicality in open quantum system models using the Wigner function
Arti Gaharwar, Devvrat Tiwari, Subhashish Banerjee
The quantum speed limit and the Wigner function of open system models are studied. To this end, we use the phase covariant and a two-qubit model interacting with a squeezed thermal…
Bipartite OTOC in open quantum systems: information scrambling and irreversibility
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee
The field of information scrambling has seen significant growth over the last decade, where the out-of-time-ordered correlator (OTOC) has emerged as a prominent tool to probe it. I…
Strong coupling non-Markovian quantum thermodynamics of a finite-bath system
Devvrat Tiwari, Baibhab Bose, Subhashish Banerjee
The focus is on understanding the quantum thermodynamics of strongly coupled non-Markovian quantum systems. To this end, a non-trivial, non-Markovian model of a central spin surrou…
Impact of non-Markovian quantum Brownian motion on quantum batteries
Gourab Bhanja, Devvrat Tiwari, Subhashish Banerjee
Recently, there has been an upsurge of interest in quantum thermodynamic devices, notably quantum batteries. Quantum batteries serve as energy storage devices governed by the rules…
Quantum chaos in the Dicke model and its variants
Devvrat Tiwari, Subhashish Banerjee
Recently, the out-of-time-ordered correlator (OTOC) has gained much attention as an indicator of quantum chaos. In the semi-classical limit, its exponential growth rate resembles t…
Impact of non-Markovian evolution on characterizations of quantum thermodynamics
Devvrat Tiwari, Subhashish Banerjee
Here we study the impact of non-Markovian evolution on prominent characteristics of quantum thermodynamics, such as ergotropy and power. These are benchmarked by the behavior of th…
Quantum Discord and Logarithmic Negativity in the Generalized n-qubit Werner State
M. S. Ramkarthik, Devvrat Tiwari, Pranay Barkataki
Quantum Discord (QD) is a measure of the total quantum non-local correlations of a quantum system. The formalism of quantum discord has been applied to various two-qubit mixed stat…
A study of the quasi-probability distributions of the Tavis-Cummings model under different quantum channels
Devvrat Tiwari, Subhashish Banerjee
We study the dynamics of the spin and cavity field of the Tavis-Cummings model using quasi-probability distribution functions and second order coherence function, respectively. The…
Quantum correlations and speed limit of central spin system
Devvrat Tiwari, K. G. Paulson, Subhashish Banerjee
In this article, we consider single, and two-qubit central spin systems interacting with spin baths and discuss their dynamical properties. We consider the cases of interacting and…
Dynamics of two central spins immersed in spin baths
Devvrat Tiwari, Shounak Datta, Samyadeb Bhattacharya +1
In this article we derive the exact dynamics of a two qubit (spin 1/2) system interacting centrally with separate fermionic baths composed of qubits in thermal state. Further, each…