Theory for coherent control of longitudinal optical phonons in GaAs using polarized optical pulses with relative phase locking

The intrinsic photoconductivity of several samples of the alloy GaAsxSb1−x has been studied at 4.2 K in the presence of magnetic fields of up to 65 kG. Values for the band-gap, the reduced effective mass of the carriers, the energy of the longitudinal optical phonons across the alloy composition are deduced from the measurements.

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Quadrature entanglement in the microwave domain with a phase locking protocol

EPL (Europhysics Letters) ◽

10.1209/0295-5075/ac3bdb ◽

2021 ◽

Author(s):

Tianli Wei ◽

Dewei Wu ◽

Qiang Miao ◽

Chunyan Yang

Keyword(s):

Relative Phase ◽

Phase Locking ◽

Error Signal ◽

Parametric Amplifiers ◽

Theoretical Derivation ◽

Entanglement Generation ◽

The Past ◽

Potential Applications ◽

Locking Protocol ◽

Quantum Technology

Abstract Entanglement has attracted great attention in the past few decades due to its potential applications in the field of quantum information protocols. From now, achieving excellent phase locking in entanglement generation is significant yet a challenging task in cryogenic quantum technology. In this work, we propose and demonstrate a comprehensive paradigm of phase locking protocol for quadrature entanglement at the microwave wavelengths. We carry out a theoretical derivation of the quadrature entangled microwaves generated based on Josephson Parametric Amplifiers (JPAs), and the phase locking error signal, which is used to lock the relative phase of zero between the two quadrature squeezed microwaves. Simulating data for the phase locking scheme are shown under different parameter settings for comparison. Finally, we use the proposed phase locking scheme to enable a stable output of quadrature entangled microwave.

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Importance of confined longitudinal optical phonons in intersubband and backward scattering in rectangular AlGaAs/GaAs quantum wires

Journal of Applied Physics ◽

10.1063/1.354729 ◽

1993 ◽

Vol 74 (3) ◽

pp. 2097-2099 ◽

Cited By ~ 3

Author(s):

W. Jiang ◽

J. P. Leburton

Keyword(s):

Quantum Wires ◽

Longitudinal Optical ◽

Optical Phonons

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Raman studies of the decay of the longitudinal optical phonons in wurtzite GaN and AlxGa1-xN

10.1117/12.381468 ◽

2000 ◽

Author(s):

Kong-Thon F. Tsen ◽

David K. Ferry ◽

Stephen M. Goodnick ◽

A. Salvador ◽

Hadis Morkoc

Keyword(s):

Longitudinal Optical ◽

Optical Phonons

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Vertical hopper compositions for preflexive and feedback-stabilized quadrupedal bounding, pacing, pronking, and trotting

The International Journal of Robotics Research ◽

10.1177/0278364918779874 ◽

2018 ◽

Vol 37 (7) ◽

pp. 743-778 ◽

Cited By ~ 16

Author(s):

Avik De ◽

Daniel E. Koditschek

Keyword(s):

Relative Phase ◽

Phase Locking ◽

Formal Analysis ◽

Feedback Stabilization ◽

Hybrid Dynamical Systems ◽

Numerical Studies ◽

Physical Experiments ◽

Low Degree ◽

The Relationship ◽

Phase Relationships

This paper applies an extension of classical averaging methods to hybrid dynamical systems, thereby achieving formally specified, physically effective and robust instances of all virtual bipedal gaits on a quadrupedal robot. Gait specification takes the form of a three parameter family of coupling rules mathematically shown to stabilize limit cycles in a low degree of freedom template: an abstracted pair of vertical hoppers whose relative phase locking encodes the desired physical leg patterns. These coupling rules produce the desired gaits when appropriately applied to the physical robot. The formal analysis reveals a distinct set of morphological regimes determined by the distribution of the body’s inertia within which particular phase relationships are naturally locked with no need for feedback stabilization (or, if undesired, must be countermanded by the appropriate feedback), and these regimes are shown empirically to analogously govern the physical machine as well. In addition to the mathematical stability analysis and data from physical experiments we summarize a number of extensive numerical studies that explore the relationship between the simple template and its more complicated anchoring body models.

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Attosecond coherent manipulation of electrons in tunneling microscopy

Science ◽

10.1126/science.aaz1098 ◽

2019 ◽

Vol 367 (6476) ◽

pp. 411-415 ◽

Cited By ~ 12

Author(s):

M. Garg ◽

K. Kern

Keyword(s):

Tunnel Junction ◽

Coherent Control ◽

Scanning Tunneling ◽

Tunneling Microscopy ◽

Optical Pulses ◽

Nanoelectronic Devices ◽

Electronic Current ◽

And Control ◽

Coherent Manipulation ◽

Manipulation And Control

Nanoelectronic devices operating in the quantum regime require coherent manipulation and control over electrons at atomic length and time scales. We demonstrate coherent control over electrons in a tunnel junction of a scanning tunneling microscope by means of precise tuning of the carrier-envelope phase of two-cycle long (<6-femtosecond) optical pulses. We explore photon and field-driven tunneling, two different regimes of interaction of optical pulses with the tunnel junction, and demonstrate a transition from one regime to the other. Our results show that it is possible to induce, track, and control electronic current at atomic scales with subfemtosecond resolution, providing a route to develop petahertz coherent nanoelectronics and microscopy.

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