Direct and indirect couplings in coherent feedback control of linear quantum systems

G Zhang, MR James - IEEE Transactions on Automatic Control, 2010 - ieeexplore.ieee.org
The purpose of this paper is to study and design direct and indirect couplings for use in
coherent feedback control of a class of linear quantum stochastic systems. A general …

Quantum coherent nonlinear feedback with applications to quantum optics on chip

J Zhang, RB Wu, Y Liu, CW Li… - IEEE transactions on …, 2012 - ieeexplore.ieee.org
In the control of classical mechanical systems, feedback has been applied to the generation
of desired nonlinear dynamics, eg, in chaos control. However, how much this can be done is …

Feedback stabilization of discrete-time quantum systems subject to non-demolition measurements with imperfections and delays

H Amini, RA Somaraju, I Dotsenko, C Sayrin… - Automatica, 2013 - Elsevier
We consider a controlled quantum system whose finite dimensional state is governed by a
discrete-time nonlinear Markov process. In open-loop, the measurements are assumed to be …

Stabilizing two-qubit entanglement with dynamically decoupled active feedback

S Greenfield, L Martin, F Motzoi, KB Whaley… - Physical Review …, 2024 - APS
We propose and analyze a protocol for stabilizing a maximally entangled state of two
noninteracting qubits using active state-dependent feedback from a continuous two-qubit …

Stabilization of stochastic quantum dynamics via open-and closed-loop control

F Ticozzi, K Nishio, C Altafini - IEEE Transactions on Automatic …, 2012 - ieeexplore.ieee.org
In this paper, we investigate parametrization-free solutions of the problem of quantum pure
state preparation and subspace stabilization by means of Hamiltonian control, continuous …

Non-smooth Lyapunov function-based global stabilization for quantum filters

SS Ge, TL Vu, CC Hang - Automatica, 2012 - Elsevier
This paper addresses the global stabilization problem for a class of quantum filters via non-
smooth Lyapunov functions. Due to the intrinsic symmetric topology of filter state space, the …

Two-step feedback preparation of entanglement for qubit systems with time delay

Y Liu, D Dong, S Kuang, IR Petersen, H Yonezawa - Automatica, 2021 - Elsevier
Quantum entanglement plays a fundamental role in quantum computation and quantum
communication. Feedback control has been widely used in stochastic quantum systems to …

Quantum measurement-based feedback control: a nonsmooth time delay control approach

SS Ge, TL Vu, TH Lee - SIAM Journal on Control and Optimization, 2012 - SIAM
This paper addresses the problem of measurement-based feedback control for quantum
systems, in which the time to compute the filter-based control input is taken into account by …

Quantum feedback control of a two-atom network closed by a semi-infinite waveguide

H Ding, G Zhang, MT Cheng, G Cai - arxiv preprint arxiv:2306.06373, 2023 - arxiv.org
The purpose of this paper is to study the delay-dependent coherent feedback dynamics by
focusing on one typical realization, ie, a two-atom quantum network whose feedback loop is …

Dissipative feedback switching for quantum stabilization

W Liang, T Grigoletto, F Ticozzi - Automatica, 2024 - Elsevier
Switching controlled dynamics allows for fast, flexible control design methods for quantum
stabilization of pure states and subspaces, which naturally include both Hamiltonian and …