45 citations · 127 across the 12 of their papers we have counts for
9 papers · 1 filter
A quantum treatment of the Stern-Gerlach experiment
K. M. Fonseca-Romero
Most textbooks introduce the concept of spin by presenting the Stern-Gerlach experiment with the aid of Newtonian atomic trajectories. However, to understand how both spatial and s…
Partial and complete qubit estimation using a single observable: optimization and quantum simulation
Cristian A. Galvis Florez, J. Martínez-Cifuentes, K. M. Fonseca-Romero
Quantum state estimation is an important task of many quantum information protocols. We consider two families of unitary evolution operators, one with a one-parameter and the other…
Classical models may be a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model
Javier Martínez-Cifuentes, K. M. Fonseca-Romero, Nicolás Quesada
Recently, Zhong et al. performed landmark Gaussian boson sampling experiments with up to 144 modes using threshold detectors. The authors claim to have achieved quantum computation…
Spin-state estimation using the Stern-Gerlach experiment
Javier Martínez-Cifuentes, K. M. Fonseca-Romero
We propose a state estimation scheme for spins, using a modified setup of the Stern-Gerlach experiment, in which a beam of neutral spin-1/2 point particles interacts with a quadrup…
Single plane minimal tomography of double slit qubits
Edwin C. Chaparro Sogamoso, D. Angulo, K. M. Fonseca-Romero
The determination of the density matrix of an ensemble of identically prepared quantum systems by performing a series of measurements, known as quantum tomography, is minimal when…
A statistical portrait of the entanglement decay of two-qubit memories
Karen M. Fonseca-Romero, Julián Martínez-Rincón, Carlos Viviescas
We present a novel approach to the study of entanglement decay, which focuses on collective properties. As an example, we investigate the entanglement decay of a two-qubit system,…
Decoherence and entanglement in tripartite systems: Cavity QED
E. Agudelo, B. A. Rodriguez, K. M. Fonseca-Romero
We propose an experimental setup, feasible with present day technology, involving two highquality- factor cavities, one Ramsey zone and a two-level atom which interacts with them.…
Coherence control for qubits
Karen M. Fonseca-Romero, Sigmund Kohler, Peter Hänggi
We study the influence of an external driving field on the coherence properties of a qubit under the influence of bit-flip noise. In the presence of driving, two paradigmatic cases…
Optimal Control of One-Qubit Gates
K. M. Fonseca-Romero, G. Useche-Laverde, F. Torres-Ardila
We consider the problem of carrying an initial Bloch vector to a final Bloch vector in a specified amount of time under the action of three control fields (a vector control field).…