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Questions tagged [ion-traps]

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Ultracold magnetic traps for uranium enrichment

As noted by Mr. Gremlin in this post: How is it possible to accelerate a neutron? Crudely paraphrasing, subatomic particles with non-zero magnetic dipole moments interact with magnetic fields to give ...
Young Jun Lee's user avatar
1 vote
2 answers
124 views

Why does the Lamb-Dicke parameter decrease with the number of ions in an ion chain

I would like to understand (ideally with a nice pedagogic reference), why the fidelity of quantum gates in long ion chain decreases with the number of ions in the chain. In this reference, it is ...
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1 answer
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Trapping of Hot Atoms [duplicate]

Is there any possible way to trap atoms that are 'hot' and the trap itself doesn't cool them, but instead can continue to trap the atoms even at high temperatures? Where hot is defined as temperatures ...
Jack's user avatar
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1 vote
1 answer
71 views

Depth of dipole trap

I am wondering about the relation between a harmonic potential (e.g. generated by a dipole trap) and temperature. I have seen couple of times that you can express the depth of the trap as a ...
ikarus's user avatar
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3 votes
2 answers
227 views

Ion Traps for "Hot" atoms

I have been researching ion traps (of singular atoms) recently and have become curious about neutral atom trapping and in particular if it is possible to trap neutral atoms while they are "hot&...
Jack's user avatar
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Linear Paul Trap and Mathieu Equation parameter

In the classical linear Paul trap, there are four rods with time-varying potentials that are equal to $\pm V_0 \cos (\Omega t)$ forming an effective quadrupole. If the trapped ion has charge $e$ and ...
grav.field's user avatar
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0 answers
22 views

At what frequencies can we treat an oscillating electric field electrostatically?

I am reading about RF ion traps that use the field generated by electrodes at voltages oscillating at RF frequencies. The approach towards resolving the electric potential at a given time within the ...
Adrien Amour's user avatar
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1 answer
137 views

Why is the potential field inside a quadrupole field given by $V=k(\alpha x^{2} +\beta y^{2} +\gamma z^{2})$ for constants $k,\alpha,\beta,\gamma$?

I am seeking an explanation regarding the origin of the potential inside a quadrupole field. The common understanding is that the potential can be described by the equation: $$V=k(\alpha x^{2} +\beta ...
Adrien Amour's user avatar
1 vote
2 answers
70 views

Current Record for the Maximum Number of Ions Trapped in a Paul (Radiofrequency) Trap

What is the current known record for the maximum number of ions that have been successfully trapped in a Paul trap? Could you also share a reference to the scientific article or any form of published ...
Andrea's user avatar
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-1 votes
1 answer
67 views

Why Coulomb crystal doesn't appear? [closed]

I am cooling randomly placed ions in a Paul trap to 0 K in the LAMMPS Molecular Dynamics Simulator package. The script is correct I think. The problem is that for trap configurations from the first ...
Aslan Monahov's user avatar
1 vote
0 answers
30 views

Are traps really required for a 3D Bose Einstein condensate?

I came across this article that claims to a have a B.E condensate of exciton polariton in 2D. However, the authors also seem to admit that is a different kind of phase transition different from a ...
AdShil00's user avatar
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Easy question regarding RF and ion traps

I saw this interesting video: https://www.youtube.com/watch?v=d-qTa_7FtAA In this video, from the 8:55 mark to 11:55, this man explains using unique frequencies for each element(?) with a unique m/z ...
Young Jun Lee's user avatar
1 vote
0 answers
69 views

Doppler cooling before sideband cooling

I've seen that Doppler cooling is used to cool down the system before performing sideband cooling. I have 2 questions about it. First, why do we need the system to be cooled before performing sideband ...
phhhy's user avatar
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1 answer
126 views

Particle Coupling in Ion Trap

Ion traps are very complex, but one of my Physics Olympiad textbooks presents a simplified model of a resonating charged particle in an ion trap A tuned circuit consists of an inductor and a parallel ...
Anmoldeep's user avatar
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How to derive the electrical potential of a quadrupole ion trap (Paul trap)?

Currently I am studying the behaviors of an ion in a quadrupole trap (Paul trap), but I just can’t understand that why the electrical potential of this trap is \begin{equation} \phi = \frac{U_0}{r_0^2}...
 Hou's user avatar
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1 answer
275 views

Does Earnshaw's theorem apply to electrostatic + gravitational systems?

I've been learning about particle traps and Earnshaw's theorem. When dealing purely with electrostatic forces the theorem makes intuitive sense to me. But does it really apply to systems involving ...
articpenguin's user avatar
1 vote
1 answer
263 views

What is the electrical potential of a quadrupole ion trap?

I learned from Wikipedia that the quadrupolar potential $\phi$ of a quadrupole ion trap is \begin{equation} \phi = \frac{\phi_0}{r_0^2}(\lambda x^2 + \sigma y^2 + \gamma z^2) \end{equation} where $...
 Hou's user avatar
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Doubt on application of uncertainty principle for an ion trap

Ion trap involves the application of an electromagnetic field to suspend and confine a charged particle. At the centre of this picture, you see a saddle shape. This means that the ions are pushed ...
PolaroidDreams's user avatar
15 votes
2 answers
2k views

Can two atoms be a crystal?

In the physics literature, you can often find the term "two-ion crystal", when talking about two ions that are confined in a e.g. Paul trap. How is this possible? Shouldn't a crystal be a structure ...
m137's user avatar
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3 votes
1 answer
1k views

The hamiltonian of single trapped ion model: ion trap quantum computer

This question is related to the textbook, "Quantum Computation and Quantum Information written by M. A. Nielsen and I. L. Chuang. I tried to derive a relation when we deal with a model system where a ...
Patche's user avatar
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110 votes
7 answers
20k views

How can we see an atom now? What was the scale of this equipment?

I've just seen this on the news - Single Trapped Atom Captures Science Photography Competition's top prize. Credit: David Nadlinger via EPSRC I am not a Physics major but I believe I do know the ...
Hanky Panky's user avatar
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12 votes
1 answer
401 views

How can one recover the classical frequency-modulation Bessel sidebands from a quantum emitter in a harmonic well?

Consider an atom that emits at frequency $\omega_0$ that's located at a position $x$ that moves under the influence of a harmonic oscillator at frequency $\nu$. In both classical and quantum physics, ...
Emilio Pisanty's user avatar
2 votes
0 answers
106 views

What, exactly, made it difficult to implement the Cirac-Zoller controlled-NOT gate when it was first proposed?

The Cirac-Zoller gate is one of the key tools in the manipulation of quantum information on a string of trapped ions, and its proposal was a huge step in the path of quantum computing from abstract ...
Emilio Pisanty's user avatar
5 votes
1 answer
540 views

Real-Life RLC circuit - why so lopsided?

I am using a superconducting $RLC$-circuit for detecting weak electrical signals. The center-frequency is around 650 kHz, and the $Q$-value approximately 50k. I am trying to better understand my ...
Martin J.H.'s user avatar
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7 votes
1 answer
868 views

Why are ytterbium atoms used for quantum computing?

Ytterbium seems to be the favorite for element for trapped ion quantum computing experiments. Why is this?
fyodrpetrovich's user avatar
1 vote
1 answer
369 views

CNOT gate with trapped ions

I'm interested in knowing the structure of a CNOT gate, in quantum computing. THe problem with that is, that I've read how the structure of a nuclear quantum computer works, but I still don't ...
Domenico Bagnato's user avatar
0 votes
1 answer
75 views

Atomic system satisfying a simple level scheme

I have a simple two level system with an allowed dipole transition between the levels. The top level is also allowed to decay to another third level (looks a bit like a lambda system). Could someone ...
Qubix's user avatar
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2 votes
1 answer
153 views

Temperature of a trapped particle

How is the temperature of the center of mass of a trapped particle (e.g. in a Paul or Penning trap with laser cooling) defined? I assume it has something to do with the equipartition theorem and ...
nabla's user avatar
  • 643
1 vote
1 answer
250 views

Why do ion traps need high voltage?

Why do we require high (order of kV) voltage in ion trap?
Yash Goyal's user avatar
6 votes
4 answers
2k views

Is fluorescence from a single atom/ion visible with the naked eye (e.g. in a strongly coupled trap or cavity)

I remember sitting in on a conference talk by a person (possibly Rainer Blatt) doing research with trapped ions (or single atoms strongly coupled to light in an optical cavity), and the person showed ...
Punk_Physicist's user avatar
2 votes
1 answer
368 views

Penning Trap Simulation

I'm currently working on a particle tracker and I would like to implement a Penning trap. I think I might have a problem with the field of the electrical quadrupole. My idea was to place 2 dipoles and ...
s0vereign's user avatar
6 votes
1 answer
228 views

What is the advantage of segmented particle traps?

I'm currently trying to familiarize myself with the physics of ion and particle traps, especially with linear Paul traps. Many scientific experiments I've come across use segmented electrodes (like in ...
Sentry's user avatar
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13 votes
0 answers
261 views

A beautiful ion-trap proposal for Boson Sampling: what are its limitations?

A very beautiful recent paper, Scalable Implementation of Boson Sampling with Trapped Ions. C. Shen, Z. Zhang, and L.-M. Duan. Phys. Rev. Lett. 112 no. 5, 050504 (2014); arXiv:1310.4860 describes ...
Emilio Pisanty's user avatar
4 votes
1 answer
1k views

Quadrupole potential generation in Paul traps

I am currently getting familiar with the concept of the Paul trap and the underlying physical principles. I do understand what kind of potentials are needed to trap charged particles, e.g. for the 3D ...
Wylde's user avatar
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