917 citations · 2.2k across the 65 of their papers we have counts for
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Robust Control of Quantum Dynamics under Input and Parameter Uncertainty
Andrew Koswara, Vaibhav Bhutoria, Raj Chakrabarti
Despite significant progress in theoretical and laboratory quantum control, engineering quantum systems remains principally challenging due to manifestation of noise and uncertaint…
Study of the spin kitten states in a strongly coupled spin-oscillator system
M. Balamurugan, R. Chakrabarti, B. Virgin Jenisha +1
Utilizing an adiabatic approximation method a bipartite qudit-oscillator Hamiltonian is explicitly studied for low spin values in both strong and ultrastrong coupling regimes. The…
Evolution of the entanglement of the -type of states in a coupled two cavity system via an adiabatic approximation
R. Chakrabarti, G. Sreekumari, V. Yogesh
We study a system of two cavities each encapsulating a qubit and an oscillator degrees of freedom. An ultrastrong interaction strength between the qubit and the oscillator is assum…
Nonclassicality and decoherence of photon-added squeezed coherent Schrödinger kitten states in a Kerr medium
R. Chakrabarti, V. Yogesh
We study the nonclassicality of the evolution of a superposition of an arbitrary number of photon-added squeezed coherent Schrödinger cat states in a nonlinear Kerr medium. The non…
Deconstruction and differentiation of squeezed kitten states in a qubit-oscillator system
M. Balamurugan, R. Chakrabarti, B. Virgin Jenisha
We study the evolution of the hybrid entangled squeezed states of the qubit-oscillator system in the strong coupling domain. Following the adiabatic approximation we obtain the red…
Evolution of a hybrid micro-macro entangled state of the qubit-oscillator system via the generalized rotating wave approximation
R. Chakrabarti, V. Yogesh
We study the evolution of the hybrid entangled states in a bipartite (ultra) strongly coupled qubit-oscillator system. Using the generalized rotating wave approximation the reduced…
Evolution of nonclassicality of the quasi-Bell states for a strongly coupled qubit-oscillator system
R. Chakrabarti, B. Virgin Jenisha
Starting with the quasi-Bell states of the qubit-oscillator system, we obtain time evolution of the density matrix under the adiabatic approximation. The composite density matrix l…
Robustness of Controlled Quantum Dynamics
Andy Koswara, Raj Chakrabarti
Control of multi-level quantum systems is sensitive to implementation errors in the control field and uncertainties associated with system Hamiltonian parameters. A small variation…
Quasi-Bell states in a strongly coupled qubit-oscillator system and their delocalization in the phase space
R. Chakrabarti, B. Virgin Jenisha
We study the evolution of bipartite entangled quasi-Bell states in a strongly coupled qubit-oscillator system in the presence of a static bias, and extend it to the ultra-strong co…
Quantum communication through Jaynes-Cummings-Hubbard arrays
R. Chakrabarti, G. Sreekumari
We study the dynamics of an one dimensional array of Jaynes-Cummings-Hubbard system of arbitrary number of coupled cavities, each containing a two level atom that interacts with a…
Search complexity and resource scaling for the quantum optimal control of unitary transformations
Katharine W. Moore, Raj Chakrabarti, Gregory Riviello +1
The optimal control of unitary transformations is a fundamental problem in quantum control theory and quantum information processing. The feasibility of performing such optimizatio…
General unifying features of controlled quantum phenomena
Alexander Pechen, Constantin Brif, Rebing Wu +2
Many proposals have been put forth for controlling quantum phenomena, including open-loop, adaptive feedback, and real-time feedback control. Each of these approaches has been view…
Quantum communication through a spin chain with interaction determined by a Jacobi matrix
R. Chakrabarti, J. Van der Jeugt
We obtain the time-dependent correlation function describing the evolution of a single spin excitation state in a linear spin chain with isotropic nearest-neighbour XY coupling, wh…
Control of quantum phenomena: Past, present, and future
Constantin Brif, Raj Chakrabarti, Herschel Rabitz
Quantum control is concerned with active manipulation of physical and chemical processes on the atomic and molecular scale. This work presents a perspective of progress in the fiel…
Asymptotic Efficiency and Finite Sample Performance of Frequentist Quantum State Estimation
Raj Chakrabarti, Anisha Ghosh
We undertake a detailed study of the performance of maximum likelihood (ML) estimators of the density matrix of finite-dimensional quantum systems, in order to interrogate generic…
Quantum Pareto Optimal Control
Raj Chakrabarti, Rebing Wu, Herschel Rabitz
We describe algorithms, and experimental strategies, for the Pareto optimal control problem of simultaneously driving an arbitrary number of quantum observable expectation values t…
Quantum Multiobservable Control
Raj Chakrabarti, Rebing Wu, Herschel Rabitz
We present deterministic algorithms for the simultaneous control of an arbitrary number of quantum observables. Unlike optimal control approaches based on cost function optimizatio…
Quantum Control Landscapes
Raj Chakrabarti, Herschel Rabitz
Numerous lines of experimental, numerical and analytical evidence indicate that it is surprisingly easy to locate optimal controls steering quantum dynamical systems to desired obj…
Computational complexity of quantum optimal control landscapes
Raj Chakrabarti, Rebing Wu, Herschel Rabitz
We study the Hamiltonian-independent contribution to the complexity of quantum optimal control problems. The optimization of controls that steer quantum systems to desired objectiv…
Orthogonal measurement-assisted quantum control
Raj Chakrabarti, Rebing Wu, Herschel Rabitz
Existing algorithms for the optimal control of quantum observables are based on locally optimal steps in the space of control fields, or as in the case of genetic algorithms, opera…
Optimal Control Theory for Continuous Variable Quantum Gates
Rebing Wu, Raj Chakrabarti, Herschel Rabitz
We apply the methodology of optimal control theory to the problem of implementing quantum gates in continuous variable systems with quadratic Hamiltonians. We demonstrate that it i…