43 citations · 141 across the 21 of their papers we have counts for
21 papers
Coherent Control of Channel Dilations Activate Temporal Bell Nonclassicality
H S Karthik, Akshata Shenoy H, A R Usha Devi +1
The temporal Clauser-Horne-Shimony-Holt (CHSH) inequality witnesses the nonclassicality of temporal correlations, but its violation is generally degraded by environmental noise. He…
Enhanced non-macrorealism: Extreme violations of Leggett-Garg inequalities for a system evolving under superposition of unitaries
Arijit Chatterjee, H. S. Karthik, T. S. Mahesh +1
Quantum theory contravenes classical macrorealism by allowing a system to be in a superposition of two or more physically distinct states, producing physical consequences radically…
Lorentz canoncial forms of two-qubit states
Sudha, A. R. Usha Devi, B. N. Karthik +4
The Bloch sphere provides an elegant way of visualizing a qubit. Analogous representation of the simplest composite state of two-qubits has attracted significant attention. Here we…
Lorentz invariants of pure three-qubit states
A R Usha Devi, Sudha, H Akshata Shenoy +2
Extending the mathematical framework of Phys. Rev. A 102, 052419 (2020) we construct Lorentz invariant quantities of pure three-qubit states. This method serves as a bridge between…
Geometric picture for SLOCC classification of pure permutation symmetric three-qubit states
K. Anjali, I. Reena, Sudha +4
The quantum steering ellipsoid inscribed inside the Bloch sphere offers an elegant geometric visualization of two-qubit states shared between Alice and Bob. The set of Bloch vector…
Geometric picture for SLOCC classification of pure permutation symmetric three-qubit states
K. Anjali, I. Reena, Sudha +4
We show that the pure entangled three-qubit symmetric states which are inequivalent under stochastic local operations and classcial communication (SLOCC) exhibit distinct geometric…
Margenau-Hill operator valued measures and joint measurability
Seeta Vasudevrao, H. S. Karthik, I. Reena +2
We employ the Margenau-Hill (MH) correspondence rule for associating classical functions with quantum operators to construct quasi-probability mass functions. Using this we obtain…
Local sum uncertainty relations for angular momentum operators of bipartite permutation symmetric systems
I. Reena, H. S. Karthik, J. Prabhu Tej +3
We show that violation of variance based local sum uncertainty relation (LSUR) for angular momentum operators of a bipartite system, proposed by Hofmann and Takeuchi~[Phys.Rev.A {\…
Canonical forms of two-qubit states under local operations
Sudha, H. S. Karthik, Rajarshi Pal +4
Canonical forms of two-qubits under the action of stochastic local operations and classical communications (SLOCC) offer great insight for understanding non-locality and entangleme…
Characterizing nonlocality of pure symmetric three-qubit states
K. Anjali, Akshata Shenoy Hejamadi, H. S. Karthik +3
We explore nonlocality of three-qubit pure symmetric states shared between Alice, Bob and Charlie using the Clauser-Horne-Shimony-Holt (CHSH) inequality. We make use of the elegant…
Algebraic maximum violation of the Leggett-Garg inequality in a two-level system under PT symmetric dynamics
H. S. Karthik, Akshata Shenoy Hejamadi, A. R. Usha Devi
We investigate the three-term Leggett-Garg inequality (LGI) for a two-level quantum system undergoing parity-time (PT ) symmetric dynamics governed by a non-Hermitian Hamiltonian,…
N term pairwise correlation inequalities, steering and joint measurability
H. S. Karthik, A. R. Usha Devi, J. Prabhu Tej +3
Chained correlation inequalities involving pairwise correlations of qubit observables in the equatorial plane are constructed based on the positivity of a sequence of moment matric…
Unsharp measurements and joint measurability
H. S. Karthik, A. R. Usha Devi, A. K. Rajagopal
We give an overview of joint unsharp measurements of non-commuting observables using positive operator valued measures (POVMs). We exemplify the role played by joint measurability…
Joint measurability, steering and entropic uncertainty
H. S. Karthik, A. R. Usha Devi, A. K. Rajagopal
The notion of incompatibility of measurements in quantum theory is in stark contrast with the corresponding classical perspective, where all physical observables are jointly measur…
Joint Measurability and Temporal Steering
H. S. Karthik, J. Prabhu Tej, A. R. Usha Devi +1
Quintino et. al. (Phys. Rev. Lett. 113, 160402 (2014)) and Uola et. al. (Phys. Rev. Lett. 113, 160403 (2014)) have recently established an intrinsic relation between non-joint meas…
Quantum which-way information and fringe visibility when the detector is entangled with an ancilla
J. Prabhu Tej, A. R. Usha Devi, H. S. Karthik +2
Quantum mechanical wave-particle duality is quantified in terms of a trade-off relation between the fringe visibility and the which-way distinguishability in an interference experi…
Entropic uncertainty assisted by temporal memory
H. S. Karthik, A. R. Usha Devi, J. Prabhu Tej +1
The uncertainty principle brings out intrinsic quantum bounds on the precision of measuring non-commuting observables. Statistical outcomes in the measurement of incompatible obser…
Equivalence of classicality and separability based on P phase-space representation of symmetric multiqubit states
A R Usha Devi, A K Rajagopal, Sudha +2
Classical and quantum world views differ in peculiar ways. Understanding decisive quantum features -- for which no classical explanation exist -- and their interrelations is of fou…
Inversion of moments to retrieve joint probabilities in quantum sequential measurements
H. S. Karthik, Hemant Katiyar, Abhishek Shukla +3
A sequence of moments encode the corresponding probability distribution. Probing if quantum joint probability distribution can be retrieved from the associated set of moments -- re…
Macrorealism from entropic Leggett-Garg inequalities
A. R. Usha Devi, H. S. Karthik, Sudha +1
We formulate entropic Leggett-Garg inequalities, which place constraints on the statistical outcomes of temporal correlations of observables. The information theoretic inequalities…
Uncertainty relations in the realm of classical dynamics
A. R. Usha Devi, H. S. Karthik
It is generally believed that classical regime emerges as a limiting case of quantum theory. Exploring such quantum-classical correspondences in a more transparent manner is centra…