Entangled coherent state is an important non-classical state of the light that allows the sensitivity of optical phase estimation by a two-mode Mach-Zehnder interferometer to attain the Heisenberg limit, the ultimate precision limit allowed by quantum mechanics. However, preparing a strong entangl...
The central issue in quantum parameter estimation is to find out the optimal measurement setup that leads to the ultimate lower bound of an estimation error. We address here a question of whether a Gaussian measurement scheme can achieve the ultimate bound for phase estimation in single-mode Gauss...
Here we demonstrate real-time optimal control of the quantum trajectory8 of an optically trapped nanoparticle. We combine confocal position sensing close to the Heisenberg limit with optimal state estimation via Kalman filtering to track the particle motion in phase space in real time with a ...
A quantum stochastic model for an open dynamical system (receiver) with output channel of observation is given. An equation for the moment generating operator of the corresponding instrument is derived and reduced equations for the wave function and density matrix of the system under the observation...
Library for solving quantum optimal control problems in Julia. Currently offers support for GRAPE and dCRAB algorithms using piecewise constant controls. grape control julia quantum quantum-mechanics quantum-computing optimal dynamo optimisation autodiff Updated Oct 4, 2021 Julia pyro...
Quantum Computing Introduction Much work has been done on thetimeandquerycomplexity of Hamiltonian simulation when given a classical description or black box description of the Hamiltonian. Lloyd provided the first formal results on simulation, considering Hamiltonians that consist of sums of non-commutin...
A Quantum Algorithm for Solving the Travelling Salesman Problem by Quantum Phase Estimation and Quantum Search the measured values of length are encoded into the states of the second quantum register, and the search for the optimal route is carried out using a ... C Tszyunsi,II Beterov - 《...
d-qpso: A quantum-behaved particle swarm technique for finding D-optimal designs with discrete and continuous factors and a binary response. Technometrics 61 (1):77–87. doi:10.1080/00401706.2018.1439405. (Open in a new window)Web of Science ®(Open in a new window)Google Scholar...
The efficient and reliable verification of quantum states plays a crucial role in various quantum information processing tasks. We consider the task of verifying entangled states using one-way and two-way classical communication and completely characteri
Quantum systems are promising candidates for sensing of weak signals as they can be highly sensitive to external perturbations, thus providing excellent performance when estimating parameters of external fields. However, when trying to detect weak signal