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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.3K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
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Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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Controlling dipole transparency with magnetic fields.

Stephen Hughes, Girish S Agarwal

    Optics Letters
    |December 15, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Magnetic fields control light transmission in quantum dot systems by tuning cavity-mediated interference. This enables precise control over light and on-chip photon properties, including phase, with potential for quantum phase gates.

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    Area of Science:

    • Quantum Optics
    • Solid-State Physics
    • Nanophotonics

    Background:

    • Quantum dot cavity systems offer unique light-matter interaction properties.
    • Controlling light transmission and phase is crucial for quantum information processing.
    • Dipole-induced transparency is a key phenomenon in such systems.

    Purpose of the Study:

    • To investigate the control of dipole-induced transparency in quantum dot cavity systems using magnetic fields.
    • To demonstrate the manipulation of light and on-chip photon transmission magnitude and phase.
    • To explore the potential for implementing quantum phase gates.

    Main Methods:

    • Coupling a linearly-polarized microcavity mode to two spin-charged exciton states of a single quantum dot.
    • Utilizing cavity-mediated interference and magnetic-field resonance shifts.
    • Operating within the good cooperativity regime for cavity coupling.

    Main Results:

    • Demonstrated control over light transmission magnitude and phase via magnetic fields.
    • Observed a triple resonance feature, robust even in weakly coupled cavities.
    • Showcased spectral squeezing in the magnetic-field-mediated central resonance peak.
    • Identified five distinct regions for 2π phase changes, suitable for phase gate implementation.

    Conclusions:

    • Magnetic fields provide a powerful tool for controlling dipole-induced transparency in quantum dot cavity systems.
    • The demonstrated phenomena pave the way for advanced optical control and quantum information applications.
    • Spectral squeezing and controllable phase shifts highlight the system's potential for quantum technologies.