Phase information revealed by interferences in the ionization of rotational wave packets

Charron, Eric; Raoult, Maurice

doi:10.1103/physreva.74.033407

Cited by 16 publications

(26 citation statements)

References 59 publications

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“…As was proposed by multiple authors [61][62][63][64][65][66], molecular wavepackets can be used to encode quantum information. Similarly, collective excitations can be used for quantum memory [18].…”

Section: Resultsmentioning

confidence: 99%

Non-adiabatic control of quantum energy transfer in ordered and disordered arrays

et al. 2013

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An elementary excitation in an aggregate of coupled particles generates a collective excited state. We show that the dynamics of these excitations can be controlled by applying a transient external potential which modifies the phase of the quantum states of the individual particles. The method is based on an interplay of adiabatic and sudden time scales in the quantum evolution of the many-body states. We show that specific phase transformations can be used to accelerate or decelerate quantum energy transfer and spatially focus delocalized excitations onto different parts of arrays of quantum particles. We consider possible experimental implementations of the proposed technique and study the effect of disorder due to the presence of impurities on its fidelity. We further show that the proposed technique can allow control of energy transfer in completely disordered systems.

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Section: Resultsmentioning

confidence: 99%

Non-adiabatic control of quantum energy transfer in ordered and disordered arrays

et al. 2013

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“…We now separate the global electronic coordinate r e of all electrons into the coordinate r c of the core electrons and the coordinate r of the active electron [59]. The ground X 1 Σ + g electronic state is considered as a 2sσ state, and the electronic wave function Φ g (r e |R) is expressed in the molecular frame (Hund's case (b) representation) as the product…”

Section: Generalization To Multi-level Systemsmentioning

confidence: 99%

Non-Hermitian wave packet approximation of Bloch optical equations

Charron

Sukharev

2013

The Journal of Chemical Physics

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We introduce a non-Hermitian approximation of Bloch optical equations. This approximation provides a complete description of the excitation, relaxation, and decoherence dynamics of ensembles of coupled quantum systems in weak laser fields, taking into account collective effects and dephasing. In the proposed method, one propagates the wave function of the system instead of a complete density matrix. Relaxation and dephasing are taken into account via automatically adjusted time-dependent gain and decay rates. As an application, we compute the numerical wave packet solution of a time-dependent non-Hermitian Schrödinger equation describing the interaction of electromagnetic radiation with a quantum nano-structure, and compare the calculated transmission, reflection, and absorption spectra with those obtained from the numerical solution of the Liouville-von Neumann equation. It is shown that the proposed wave packet scheme is significantly faster than the propagation of the full density matrix while maintaining small error. We provide the key ingredients for easy-to-use implementation of the proposed scheme and identify the limits and error scaling of this approximation.

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“…In general, in such a setup the finite size of the wires can produce non-negligible effects and can be easily taken into account. 7…”

Section: Atom Chip Architecture For Trapping Magnetic Potentialsmentioning

confidence: 99%

“…Numerical optimization gives a fidelity F > 0.999 and gate operation τ 10 ms, with realistic values for the wires' size and distance, bias magnetic fields and dc currents. 7 At the end of the gate operation, the logic state can be transferred via Raman transitions to the hyperfine clock states where it is protected against noise. 7…”

Section: A Phase Gate With Vibrational Statesmentioning

confidence: 99%