56 citations · 186 across the 21 of their papers we have counts for
23 papers
Stability in the determination of the coefficients for coupled relativistic Schrödinger system
Nitesh Kumar, Parveen Kumar, Tanmay Sarkar
In this article, we prove a stability result for the identification of the coefficients appearing in a coupled relativistic Schrödinger system posed on a bounded domain of $\mathbb…
A partial data coefficient identification inverse problem for a semilinear damped wave operator
Mandeep Kumar, Parveen Kumar, Manmohan Vashisth
This manuscript deals with a coefficient identification inverse problem for a semilinear damped wave operator in a bounded domain of . We establish the…
Stable determination of time-dependent coefficients in a reaction-diffusion-convection system
Rahul Bhardwaj, Parveen Kumar
In this manuscript, we investigate an inverse boundary value problem for a reaction-diffusion-convection system in a bounded domain of , . We aim to obta…
Reconstruction of time-dependent coefficients in a semilinear dynamical Schr{ö}dinger equation
Parveen Kumar, Gen Nakamura, Manmohan Vashisth
In the present manuscript, we study an inverse problem related to a semilinear dynamical Schr{ö}dinger equation with lower order terms, in a bounded domain of $\Rb^{1+n},n\geq 2$.…
Interference of local-measurement histories
Parveen Kumar, Igor V. Gornyi, Yuval Gefen
The evolution of a quantum system comprises two fundamental processes--continuous unitary dynamics and stochastic measurement-induced jumps. The latter are often viewed as a source…
Violations of the Leggett-Garg inequality in Hybrid Liouvillian Dynamics: The Nonlinear Role of Detector Efficiency
Sourav Paul, Parveen Kumar, Sourin Das
Violations of the Leggett-Garg inequality (LGI) up to its algebraic bound under non-Hermitian dynamics are well established theoretically. Here, we demonstrate that such extreme vi…
Gradually opening Schrödinger's box reveals a cascade of sharp dynamical transitions
Barkay Guttel, Danielle Gov, Noam Netzer +9
Quantum mechanics predicts that unobserved systems may exist in a superposition of states, yet measurement produces definite outcomes, a tension at the heart of the quantum-to-clas…
Local Magnetometry from Measurement-Induced Dissipation
Rishith Reddy, Parveen Kumar, Ankur Das
Magnetic phases are commonly identified through macroscopic magnetization, yet many ordered states, including antiferromagnets and altermagnets, possess a vanishing net moment desp…
Optimal Thermalization under Indefinite Causal Order with Identical and Asymmetric Baths
Neeraj Sharma, Parveen Kumar
Indefinite causal order (ICO), in which the order of quantum operations is placed in a coherent superposition, has been demonstrated to enhance various information-processing tasks…
General theory of slow non-Hermitian evolution
Parveen Kumar, Yuval Gefen, Kyrylo Snizhko
Non-Hermitian systems are widespread in both classical and quantum physics. The dynamics of such systems has recently become a focal point of research, showcasing surprising behavi…
Quantum state engineering by steering in the presence of errors
E. Medina-Guerra, Parveen Kumar, I. V. Gornyi +1
Quantum state engineering plays a vital role in various applications in the field of quantum information. Different strategies, including drive-and-dissipation, adiabatic cooling,…
Near-unit efficiency of chiral state conversion via hybrid-Liouvillian dynamics
Parveen Kumar, Kyrylo Snizhko, Yuval Gefen
Following the evolution under a non-Hermitian Hamiltonian (nHH) involves significant probability loss. This makes various nHH effects impractical in the quantum realm. In contrast,…
Optimized Steering: Quantum State Engineering and Exceptional Points
Parveen Kumar, Kyrylo Snizhko, Yuval Gefen +1
The state of a quantum system may be steered towards a predesignated target state, employing a sequence of weak measurements (where the detector's readouts are tra…
Comment on "How to observe and quantify quantum-discord states via correlations"
Parveen Kumar, Kyrylo Snizhko
The protocol proposed in the commented-upon article can certify zero discord; however, it fails to quantify non-zero discord for some states. Further, the protocol is less efficien…
Weak-measurement-induced phases and dephasing: broken symmetry of the geometric phase
Kyrylo Snizhko, Nihal Rao, Parveen Kumar +1
Coherent steering of a quantum state, induced by a sequence of weak measurements, has become an active area of theoretical and experimental study. For a closed steered trajectory,…
Quantum Zeno effect with partial measurement and noisy dynamics
Parveen Kumar, Alessandro Romito, Kyrylo Snizhko
We study the Quantum Zeno Effect (QZE) induced by continuous partial measurement in the presence of short-correlated noise in the system Hamiltonian. We study the survival probabil…
Weak-measurement-induced asymmetric dephasing: manifestation of intrinsic measurement chirality
Kyrylo Snizhko, Parveen Kumar, Nihal Rao +1
Geometrical dephasing is distinct from dynamical dephasing in that it depends on the trajectory traversed, hence it reverses its sign upon flipping the direction in which the path…
Engineering two-qubit mixed states with weak measurements
Parveen Kumar, Kyrylo Snizhko, Yuval Gefen
It is known that protocols based on weak measurements can be used to steer quantum systems into pre-designated pure states. Here we show that weak-measurement-based steering protoc…
Quantum Zeno effect appears in stages
Kyrylo Snizhko, Parveen Kumar, Alessandro Romito
In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates. The effect is…
Quantum Trajectory Distribution for Weak Measurement of a Superconducting Qubit: Experiment meets Theory
Parveen Kumar, Suman Kundu, Madhavi Chand +2
Quantum measurements are described as instantaneous projections in textbooks. They can be stretched out in time using weak measurements, whereby one can observe the evolution of a…
Quantum error correction using weak measurements
Parveen Kumar, Apoorva Patel
The standard quantum error correction protocols use projective measurements to extract the error syndromes from the encoded states. We consider the more general scenario of weak me…
Weak Measurements, Quantum State Collapse and the Born Rule
Apoorva Patel, Parveen Kumar
Projective measurement is used as a fundamental axiom in quantum mechanics, even though it is discontinuous and cannot predict which measured operator eigenstate will be observed i…
An Evolutionary Formalism for Weak Quantum Measurements
Apoorva Patel, Parveen Kumar
Unitary evolution and projective measurement are fundamental axioms of quantum mechanics. Even though projective measurement yields one of the eigenstates of the measured operator…