90 citations · 259 across the 27 of their papers we have counts for
27 papers
Loss-aware state space geometry for quantum variational algorithms
Ankit Gill, Kunal Pal
The natural gradient descent optimisation technique is an efficient optimising protocol for broad classes of classical and quantum systems that takes the underlying geometry of the…
A phase space approach to the wavefunction spreading and operator growth in the Krylov basis
Kunal Pal, Kuntal Pal, Keun-Young Kim
In the Wigner-Weyl phase space formulation of quantum mechanics, we analyse the problem of the spreading of an initial state or an initial operator under time evolution when descri…
Generalised state space geometry in Hermitian and non-Hermitian quantum systems
Kunal Pal
One of the key features of information geometry in the classical setting is the existence of a metric structure and a family of connections on the space of probability distribution…
Geometry of quantum states in random matrix ensembles and the chaos-integrability transition
Ankit Gill, Keun-Young Kim, Kunal Pal +1
We consider the geometry of quantum states associated with random matrix Hamiltonians belonging to ensembles that exhibit an integrable-to-chaotic transition in terms of the neares…
Quantum nonlinear effects in the number-conserving analogue gravity of Bose-Einstein condensates
Kunal Pal, Uwe R. Fischer
We consider the quantum dynamics of Bose-Einstein condensates at absolute zero, and demonstrate that an analogue gravity model going beyond the standard linearized analogue gravity…
Statistics and Complexity of Wavefunction Spreading in Quantum Dynamical Systems
Yichao Fu, Keun-Young Kim, Kunal Pal +1
We consider the statistics of the results of a measurement of the spreading operator in the Krylov basis generated by the Hamiltonian of a quantum system starting from a specified…
Dynamical interiors of Black-Bounce spacetimes
Kunal Pal, Kuntal Pal, Tapobrata Sarkar
Using the Israel-Darmois junction conditions, we obtain a class of regular dynamical interiors to the recently proposed black-bounce spacetimes which regularises the Schwarzschild…
Time-dependent Hamiltonians and Geometry of Operators Generated by Them
Kunal Pal, Kuntal Pal
We obtain the complexity geometry associated with the Hamiltonian of a quantum mechanical system, specifically in cases where the Hamiltonian is explicitly time-dependent. Using Ni…
Complexity in two-point measurement schemes
Ankit Gill, Kunal Pal, Kuntal Pal +1
We show that the characteristic function of the probability distribution associated with the change of an observable in a two-point measurement protocol with a perturbation can be…
Spread complexity evolution in quenched interacting quantum systems
Mamta Gautam, Kunal Pal, Kuntal Pal +3
We analyse time evolution of spread complexity (SC) in an isolated interacting quantum many-body system when it is subjected to a sudden quench. The differences in characteristics…
Geodesically completing regular black holes by the Simpson-Visser method
Kunal Pal, Kuntal Pal, Tapobrata Sarkar
Regular black holes are often geodesically incomplete when their extensions to negative values of the radial coordinate are considered. Here, we propose to use the Simpson-Visser m…
A rotating modified JNW spacetime as a Kerr black hole mimicker
Kunal Pal, Kuntal Pal, Rajibul Shaikh +1
The Event Horizon Telescope has recently observed the images and shadows of the compact objects M87 and Sgr A at the centres of the galaxies Messier 87 and Milky Way. This…
Time evolution of spread complexity and statistics of work done in quantum quenches
Kuntal Pal, Kunal Pal, Ankit Gill +1
We relate the probability distribution of the work done on a statistical system under a sudden quench to the Lanczos coefficients corresponding to evolution under the post-quench H…
Conformal Fisher information metric with torsion
Kunal Pal, Kuntal Pal, Tapobrata Sarkar
We consider torsion in parameter manifolds that arises via conformal transformations of the Fisher information metric, and define it for information geometry of a wide class of phy…
Time evolution of spread complexity in quenched Lipkin-Meshkov-Glick model
Mir Afrasiar, Jaydeep Kumar Basak, Bidyut Dey +2
We use the spread complexity of a time evolved state after a sudden quantum quench in the Lipkin-Meshkov-Glick (LMG) model prepared in the ground state as a probe of quantum phase…
Evolution of circuit complexity in a harmonic chain under multiple quenches
Kuntal Pal, Kunal Pal, Ankit Gill +1
We study Nielsen's circuit complexity in a periodic harmonic oscillator chain, under single and multiple quenches. In a multiple quench scenario, it is shown that the complexity sh…
Regularising the JNW and JMN naked singularities
Kunal Pal, Kuntal Pal, Pratim Roy +1
We extend the method of Simpson and Visser (SV) of regularising a black hole spacetime, to cases where the initial metric represents a globally naked singularity. We choose two par…
Analogue metric in a black bounce background
Kunal Pal, Kuntal Pal, Tapobrata Sarkar
The conventional approach of embedding an effective acoustic metric for sound motion in a background flat Minkowski space-time, has recently been extended to incorporate more gener…
Complexity in the Lipkin-Meshkov-Glick Model
Kunal Pal, Kuntal Pal, Tapobrata Sarkar
We study complexity in a spin system with infinite range interaction, via the paradigmatic Lipkin-Meshkov-Glick model, in the thermodynamic limit. Exact expressions for the Nielsen…
Shadows in conformally related gravity theories
Kunal Pal, Kuntal Pal, Rajibul Shaikh +1
Null geodesics are invariant under a conformal transformation, and thus it might seem natural to assume that the observables corresponding to the shadow of a space-time are also co…
Nielsen complexity of coherent spin state operators
Kunal Pal, Kuntal Pal, Tapobrata Sarkar
We calculate Nielsen's circuit complexity of coherent spin state operators. An expression for the complexity is obtained by using the small angle approximation of the Euler angle p…
Constraining alternatives to the Kerr black hole
Rajibul Shaikh, Kunal Pal, Kuntal Pal +1
The recent observation of the shadow of the supermassive compact object M87 by the Event Horizon Telescope (EHT) collaboration has opened up a new window to probe the strong gr…
Disformal transformations and the motion of a particle in semi-classical gravity
Sandip Chowdhury, Kunal Pal, Kuntal Pal +1
The approach to incorporate quantum effects in gravity by replacing free particle geodesics with Bohmian non-geodesic trajectories has an equivalent description in terms of a confo…
Quantum potential in dust collapse with a negative cosmological constant
Sandip Chowdhury, Kunal Pal, Kuntal Pal +1
In the functional Schrodinger formalism, we obtain the wave function describing collapsing dust in an anti-de Sitter background, as seen by a co-moving observer, by mapping the res…