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14 papers · 1 filter
Comment on "Non-monotonicity in the Quantum-Classical Transition: Chaos Induced by Quantum Effects"
Justin Finn, Kurt Jacobs, Bala Sundaram
In a recent Letter [PRL 101, 074101 (2008)], Kapulkin and Pattanayak presented evidence that a quantum Duffing oscillator, sufficiently damped so that it is not classically chaotic…
Realistic quantum manipulation of two-level system fluctuators
L. Tian, K. Jacobs
Two-level system fluctuators in superconducting devices have demonstrated coherent coupling with superconducting qubits. Here, we show that universal quantum logic gates can be rea…
Engineering Giant Nonlinearities in Quantum Nanosystems
Kurt Jacobs, Andrew Landahl
We describe a method to engineer giant nonlinearities in, and probes to measure nonlinear observables of, mesoscopic quantum resonators. This involves tailoring the Hamiltonian of…
A Monte Carlo Method for Modeling Thermal Damping: Beyond the Brownian-Motion Master Equation
Kurt Jacobs
The "standard" Brownian motion master equation, used to describe thermal damping, is not completely positive, and does not admit a Monte Carlo method, important in numerical simula…
Locally Optimal Control of Quantum Systems with Strong Feedback
Alireza Shabani, Kurt Jacobs
For quantum systems with high purity, we find all observables that, when continuously monitored, maximize the instantaneous reduction in the von Neumann entropy. This allows us to…
Rapid Measurement of Quantum Systems using Feedback Control
Joshua Combes, Howard M. Wiseman, Kurt Jacobs
We introduce a feedback control algorithm that increases the speed at which a measurement extracts information about a -dimensional system by a factor that scales as . Gene…