92 citations · 363 across the 21 of their papers we have counts for
21 papers
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,…
Quantum hypothesis testing and state discrimination
J. Prabhu Tej, Syed Raunaq Ahmed, A. R. Usha Devi +1
This expository article gives an overview of the theory of hypothesis testing of quantum states in finite dimensional Hilbert spaces. Optimal measurement strategy for testing binar…
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…
Quantum dynamical maps and Markovianity
A. R. Usha Devi, A. K. Rajagopal, Sudha
It is known that the time evolution of a subsystem from an initial state to two later times, t1, t2 (t2 > t1), are both completely positive (CP) but it is shown here that in the in…
Spin Squeezing and Quantum Correlations
A. R. Usha Devi, Sudha
Recent years have witnessed revolutionary improvement in the production, manipulation, characterization and quantification of multiatom (multiqubit) states - because of their promi…
Open system quantum dynamics with correlated initial states, not completely positive maps and non-Markovianity
A. R. Usha Devi, A. K. Rajagopl, Sudha
Dynamical A and B maps have been employed extensively by Sudarshan and co-workers to investigate open system evolution of quantum systems. A canonical structure of the A-map is int…