3 papers
quant-ph2025
Reduced dynamics in quasi-Hermitian systems
Himanshu Badhani, C. M. Chandrashekar
Evolutions under non-Hermitian Hamiltonians with unbroken symmetry can be considered unitary under appropriate choices of inner products, facilitated by the so-calle…
quant-ph2025
Quantum walks under superposition of causal order
Prateek Chawla, Shrikant Utagi, C. M. Chandrashekar
We set the criteria under which superposition of causal order can be incorporated in to quantum walks. In particular, we show that only periodic quantum walks or those with at leas…
quant-ph2024
Non-Hermitian quantum walks and non-Markovianity: the coin-position interaction
Himanshu Badhani, Subhashish Banerjee, C. M. Chandrashekar
A -symmetric, non-Hermitian Hamiltonian in the -unbroken regime can lead to unitary dynamics under the appropriate choice of the Hilbert space. The Hilb…