Optical precursors in waveguide quantum electrodynamics
- URL: http://arxiv.org/abs/2203.01401v2
- Date: Tue, 18 Apr 2023 13:53:41 GMT
- Title: Optical precursors in waveguide quantum electrodynamics
- Authors: Silvia Cardenas-Lopez, Pablo Solano, Luis A. Orozco, Ana Asenjo-Garcia
- Abstract summary: When a broadband signal propagates through a dispersive medium, some frequency components move faster than the center of the pulse.
This leads to the appearance of precursors, transient signals that emerge from the medium earlier than the main part of the pulse and seem to propagate superluminally.
Our results pave the way towards dispersion engineering of light with just a few qubits, and can be realized with superconducting qubits coupled to transmission lines or atoms coupled to optical waveguides.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: When a broadband signal propagates through a dispersive medium, some
frequency components move faster than the center of the pulse. This leads to
the appearance of precursors, transient signals that emerge from the medium
earlier than the main part of the pulse and seem to propagate superluminally.
Here, we investigate the microscopic origin of precursors in a minimal setup:
an array of qubits coupled to a waveguide. The linear transmission function
only converges to that of a continuous medium for large qubit numbers.
Nevertheless, the dispersion produced by only two qubits is enough to produce
oscillatory transients. Precursors are best observed under conditions of
electromagnetically-induced transparency, as the center of the pulse is
significantly delayed. Under these conditions, just a single qutrit is enough
to generate a precursor. Our results pave the way towards dispersion
engineering of light with just a few qubits, and can be realized with
superconducting qubits coupled to transmission lines or atoms coupled to
optical waveguides.
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