Concept

Quantum tomography

Publications associées (53)

Accelerating Calculations of Ultrafast Time-Resolved Electronic Spectra with Efficient Quantum Dynamics Methods

Jiri Vanicek, Miroslav Sulc, Marius Wehrle

We explore three specific approaches for speeding up the calculation of quantum time correlation functions needed for time-resolved electronic spectra. The first relies on finding a minimum set of sufficiently accurate electronic surfaces. The second incre ...

2011

Coherent coupling between distant excitons revealed by two-dimensional nonlinear hyperspectral imaging

Vincenzo Savona

Coherent coupling between distant two-level systems is a fundamental process in several physical contexts, from natural photosynthesis to quantum-information processing, where it enables two-qubit operations. For quantum information, qubits based on electr ...

2011

Communications: Evaluation of the nondiabaticity of quantum molecular dynamics with the dephasing representation of quantum fidelity

Jiri Vanicek, Tomas Zimmermann

We propose an approximate method for evaluating the importance of non-Born–Oppenheimer effects on the quantum dynamics of nuclei. The method uses a generalization of the dephasing representation (DR) of quantum fidelity to several diabatic potential energy ...

American Institute of Physics2010

Resolved-sideband cooling and position measurement of a micromechanical oscillator close to the Heisenberg uncertainty limit

Tobias Kippenberg, Albert Schliesser

The theory of quantum measurement of mechanical motion, describing the mutual coupling of a meter and a measured object, predicts a variety of phenomena such as quantum backaction, quantum correlations and non-classical states of motion. In spite of great ...

2009

Device-independent state estimation based on Bell's inequalities

Timothy Chi Hin Liew

The only information available about an alleged source of entangled quantum states is the amount S by which the Clauser-Horne-Shimony-Holt inequality is violated: nothing is known about the nature of the system or the measurements that are performed. We di ...

2009

Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths

Francis Lévy, Konstantinos Lagoudakis, Francesco Marsili, Alessandro Gaggero

Optical-to-electrical conversion, which is the basis of the operation of optical detectors, can be linear or nonlinear. When high sensitivities are needed, single-photon detectors are used, which operate in a strongly nonlinear mode, their response being i ...

Nature Publishing Group2008

Decoherence and excitation-transfer mechanisms in semiconductor quantum dots

Gaetano Parascandolo

The aim of this thesis is to supply a theoretical study of the interaction mechanisms between quantum dots beyond the simple picture of macroatoms. Coulomb interaction between excitons, exciton-phonon interaction as well as radiative interaction are, in pa ...

EPFL2007

Photonic crystal microcavities for classical and quantum information processing

Hatice Altug

Photonic crystal (PC) cavities enable localization of light into volumes (V) below a cubic optical wavelength (smaller than any other types of optical resonators) with high quality (Q) factors [1]. This permits a strong interaction of light and matter, whi ...

IEEE2006

Long-range radiative interaction between semiconductor quantum dots

Vincenzo Savona, Gaetano Parascandolo

We develop a Maxwell-Schrodinger formalism in order to describe the radiative interaction mechanism between semiconductor quantum dots. We solve the Maxwell equations for the electromagnetic field coupled to the polarization field of a quantum dot ensemble ...

2005

Quantum state resolved studies of gas/surface reaction dynamics

Thomas Rizzo, Rainer Beck

Laser light is an invaluable tool for detailed experimental studies of chemical reactions. The ability to prepare reagent molecules in specific quantum states and to resolve the quantum state distribution of reaction products using laser radiation has been ...

2004

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