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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Quantum ratchet accelerator without a bichromatic lattice potential.

Jiao Wang¹, Jiangbin Gong

¹Temasek Laboratories, National University of Singapore, 117542, Singapore.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 15, 2008

Summary

Researchers developed a novel quantum ratchet accelerator that generates directed current using quantum chaos, bypassing the need for biased fields. This system offers a new pathway for controlling quantum transport phenomena.

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Area of Science:

Quantum physics
Nonlinear dynamics
Condensed matter physics

Background:

Quantum ratchet accelerators can generate directed current without external bias.
Classical chaos in ratchet systems violates established transport sum rules.
Previous models often relied on bichromatic lattice potentials.

Purpose of the Study:

To propose a simplified quantum ratchet accelerator model.
To demonstrate the generation of linearly increasing quantum current.
To explore the role of full classical chaos in this new system.

Main Methods:

Utilizing a variant of the on-resonance kicked-rotor system.
Employing two optical lattice potentials with unequal amplitudes and a phase shift.
Analyzing the dependence of current acceleration rate on system parameters.

Main Results:

A linearly increasing quantum current is dynamically generated.
The system exhibits full classical chaos.
The model avoids the need for a bichromatic lattice potential.

Conclusions:

The proposed quantum ratchet accelerator offers a simpler alternative for generating directed quantum current.
The system provides a platform for studying quantum chaos and transport.
Experimental realization using cold atoms is feasible with minor modifications to existing setups.