546 research outputs found
From a single- to a double-well Penning trap
The new generation of planar Penning traps promises to be a flexible and
versatile tool for quantum information studies. Here, we propose a fully
controllable and reversible way to change the typical trapping harmonic
potential into a double-well potential, in the axial direction. In this
configuration a trapped particle can perform coherent oscillations between the
two wells. The tunneling rate, which depends on the barrier height and width,
can be adjusted at will by varying the potential difference applied to the trap
electrodes. Most notably, tunneling rates in the range of kHz are achievable
even with a trap size of the order of 100 microns.Comment: 4 pages, 7 figure
Spin chains with electrons in Penning traps
We demonstrate that spin chains are experimentally feasible using electrons
confined in micro-Penning traps, supplemented with local magnetic field
gradients. The resulting Heisenberg-like system is characterized by coupling
strengths showing a dipolar decay. These spin chains can be used as a channel
for short distance quantum communication. Our scheme offers high accuracy in
reproducing an effective spin chain with relatively large transmission rate.Comment: 21 pages, 1 figure, accepted for publication in PR
Reversible optical to microwave quantum interface
We describe a reversible quantum interface between an optical and a microwave
field using a hybrid device based on their common interaction with a
micro-mechanical resonator in a superconducting circuit. We show that, by
employing state-of-the-art opto-electro-mechanical devices, one can realise an
effective source of (bright) two-mode squeezing with an optical idler (signal)
and a microwave signal, which can be used for high-fidelity transfer of quantum
states between optical and microwave fields by means of continuous variable
teleportation.Comment: 5 + 3 pages, 5 figure
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