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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Trapped-ion quantum logic gates based on oscillating magnetic fields.

C Ospelkaus1, C E Langer, J M Amini

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Letters
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

Magnetic fields enable faster quantum gates for trapped ions, reducing laser complexity and decoherence. This approach offers a promising alternative for quantum information processing.

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Area of Science:

  • Quantum Information Processing
  • Atomic Physics
  • Quantum Computing

Background:

  • Trapped-ion systems are a leading platform for quantum information processing (QIP).
  • Current QIP methods often rely on laser-induced gates, which can be complex and prone to decoherence.
  • Spontaneous scattering from lasers is a fundamental limitation in current trapped-ion QIP.

Purpose of the Study:

  • To explore the use of oscillating magnetic fields and field gradients for implementing quantum gates in trapped-ion systems.
  • To assess the feasibility of achieving high-speed quantum gates using magnetic-field-mediated interactions.
  • To identify potential advantages of magnetic-field-based gates over laser-mediated gates.

Main Methods:

  • Utilizing oscillating magnetic fields and field gradients generated by microfabricated surface-electrode traps.
  • Implementing single-qubit rotations and entangling multi-qubit quantum gates.
  • Comparing gate speeds with optically induced gates for realistic ion-electrode distances.

Main Results:

  • Magnetic fields and field gradients can implement single-qubit and multi-qubit gates for trapped-ion QIP.
  • Achievable gate speeds are comparable to optical gates for realistic ion-crystal to electrode distances.
  • Magnetic-field-mediated gates significantly reduce laser control overhead and motional-state initialization requirements.

Conclusions:

  • Magnetic-field-mediated gates offer a viable and potentially superior alternative to laser-mediated gates in trapped-ion QIP.
  • This approach minimizes spontaneous scattering, a key source of decoherence, leading to more robust quantum operations.
  • The reduced complexity in control and initialization paves the way for more scalable and efficient trapped-ion quantum computers.