Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses

Agueny, Hicham

doi:10.1038/s41598-019-57125-z

“…The equation is solved using a Split-operator method combined with a fast Fourier transform algorithm. Details about the method and numerical convergence have been discussed in our previous works 36 , 37 .…”

Section: Methodsmentioning

confidence: 99%

Coherent electron displacement for quantum information processing using attosecond single cycle pulses

Agueny

¹

2020

Sci Rep

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Coherent electron displacement is a conventional strategy for processing quantum information, as it enables to interconnect distinct sites in a network of atoms. The efficiency of the processing relies on the precise control of the mechanism, which has yet to be established. Here, we theoretically demonstrate a new route to drive the electron displacement on a timescale faster than that of the dynamical distortion of the electron wavepacket by utilizing attosecond single-cycle pulses. The characteristic feature of these pulses relies on a vast momentum transfer to an electron, leading to its displacement following a unidirectional path. The scenario is illustrated by revealing the spatiotemporal nature of the displaced wavepacket encoding a quantum superposition state. We map out the associated phase information and retrieve it over long distances from the origin. Moreover, we show that a sequence of such pulses applied to a chain of ions enables attosecond control of the directionality of the coherent motion of the electron wavepacket back and forth between the neighbouring sites. An extension to a two-electron spin state demonstrates the versatility of the use of these pulses. Our findings establish a promising route for advanced control of quantum states using attosecond single-cycle pulses, which pave the way towards ultrafast processing of quantum information as well as imaging.

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“…The equation is solved using a Split-operator method combined with a fast Fourier transform algorithm. Details about the method and numerical convergence have been discussed in our previous works 36,37 . In all the calculations performed in the present work, we use the dipole approximation to describe the interaction between the laser fields and the target.…”

Section: Methodsmentioning

confidence: 99%

Coherent electron displacement for quantum information processing using attosecond single cycle pulses

Agueny¹

2020

Preprint

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Coherent electron displacement is a conventional strategy for processing quantum information, as it enables to interconnect distinct sites in a network of atoms. The efficiency of the processing relies on the precise control of the mechanism, which has yet to be established. Here, we theoretically demonstrate a new route to drive the electron displacement on a timescale faster than that of the dynamical distortion of the electron wavepacket by utilizing attosecond single-cycle pulses. The characteristic feature of these pulses relies on a vast momentum transfer to an electron, leading to its displacement following a unidirectional path. The scenario is illustrated by revealing the spatiotemporal nature of the displaced wavepacket encoding a quantum superposition state. We map out the associated phase information and retrieve it over long distances from the origin. Moreover, we show that a sequence of such pulses applied to a chain of ions enables attosecond control of the directionality of the coherent motion of the electron wavepacket back and forth between the neighbouring sites. An extension to a two-electron spin state demonstrates the versatility of the use of these pulses. Our findings establish a promising route for advanced control of quantum states using attosecond single-cycle pulses, which pave the way towards ultrafast processing of quantum information as well as imaging.

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“…Having established a comprehensive picture of the role of an IR single-cycle pulse in inducing high-energy plateaus, we now discuss how this phenomenon can be controlled. Taking advantage of the properties of the optical phase in controlling the continuum wavepacket, as it has been discussed in the context of a single-color few-cycle pulse [60] and within a two-color scheme involving two multi-cycle laser pulses [58,61], we aim here at implementing this control procedure. The basic physics involved in this control scheme is that the ionized electrons are presumed to follow the instantaneous oscillating field, as shown in Figure 3d.…”

Section: Irmentioning

confidence: 99%

Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation

Taoutioui

¹

,

Agueny

²

2021

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High-order harmonic generation is a nonlinear process that converts the gained energy during light-matter interaction into high-frequency radiation, thus resulting in the generation of coherent attosecond pulses in the XUV and soft x-ray regions. Here, we propose a control scheme for enhancing the efficiency of HHG process induced by an intense near-infrared (NIR) multi-cycle laser pulse. The scheme is based on introducing an infrared (IR) single-cycle pulse and exploiting its characteristic feature that manifests by a non-zero displacement effect to generate high-photon energy. The proposed scenario is numerically implemented on the basis of the time-dependent Schrödinger equation. In particular, we show that the combined pulses allow one to produce high-energy plateaus and that the harmonic cutoff is extended by a factor of 3 compared to the case with the NIR pulse alone. The emerged high-energy plateaus is understood as a result of a vast momentum transfer from the single-cycle field to the ionized electrons while travelling in the NIR field, thus leading to high-momentum electron recollisions. We also identify the role of the IR single-cycle field for controlling the directionality of the emitted electrons via the IR-field induced electron displacement effect. We further show that the emerged plateaus can be controlled by varying the relative carrier-envelope phase between the two pulses as well as the wavelengths. Our findings pave the way for an efficient control of light-matter interaction with the use of assisting femtosecond single-cycle fields.

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Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses

Cited by 7 publications

References 52 publications

Coherent electron displacement for quantum information processing using attosecond single cycle pulses

Coherent electron displacement for quantum information processing using attosecond single cycle pulses

Coherent electron displacement for quantum information processing using attosecond single cycle pulses

Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation

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