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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

50.1K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
50.1K
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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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...
5.9K
Magnetic Field Lines01:19

Magnetic Field Lines

5.8K
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:
5.8K
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.7K
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...
2.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.3K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Magnetic field compatible circuit quantum electrodynamics with graphene Josephson junctions.

J G Kroll1, W Uilhoorn1, K L van der Enden1

  • 1QuTech and Kavli Institute for Nanoscience, Delft University of Technology, 2600 GA, Delft, The Netherlands.

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Summary
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Graphene Josephson junctions create novel transmon qubits for quantum computing. These qubits are insensitive to magnetic fields, enabling new research in mesoscopic quantum effects.

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Area of Science:

  • Condensed matter physics
  • Quantum computing
  • Mesoscopic physics

Background:

  • Circuit quantum electrodynamics is crucial for studying mesoscopic effects in hybrid systems.
  • Transmon qubits are essential for quantum computing proposals but typically struggle in strong magnetic fields.

Purpose of the Study:

  • To develop graphene-based transmon qubits for quantum computing applications.
  • To investigate the behavior of superconducting circuits with graphene Josephson junctions in strong magnetic fields.

Main Methods:

  • Integration of monolayer graphene Josephson junctions into microwave frequency superconducting circuits.
  • Utilizing dispersive microwave spectroscopy to analyze circuit properties.
  • Performing energy level spectroscopy in parallel magnetic fields up to 1 Tesla.

Main Results:

  • Observed graphene's characteristic band dispersion, confirming ballistic transport in Josephson junctions.
  • Demonstrated graphene-based transmons are insensitive to applied magnetic fields due to their monoatomic thickness.
  • Successfully performed spectroscopy in a 1 Tesla magnetic field, significantly higher than previous studies.

Conclusions:

  • Graphene-based superconducting circuits offer a promising platform for quantum computing.
  • These circuits are suitable for exploring mesoscopic quantum effects in high magnetic fields.