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

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Published on: August 2, 2019

Dispersive photon blockade in a superconducting circuit.

A J Hoffman¹, S J Srinivasan, S Schmidt

¹Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters

|August 27, 2011

Summary

Superconducting circuits enable mediated photon-photon interactions, demonstrating a dispersive photon blockade. This phenomenon, analogous to Coulomb blockade in quantum dots, shows potential for future condensed matter experiments.

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Area of Science:

Quantum optics
Superconducting circuits
Condensed matter physics

Background:

Mediated photon-photon interactions are crucial for quantum information processing.
Superconducting circuits offer a promising platform for realizing quantum phenomena.
Dispersive photon blockade is a key effect for controlling light-matter interactions.

Purpose of the Study:

To experimentally realize and characterize mediated photon-photon interactions in a superconducting system.
To investigate the phenomenon of dispersive photon blockade.
To explore the potential of this system for future condensed matter experiments.

Main Methods:

Utilizing a superconducting coplanar waveguide cavity coupled to a superconducting charge qubit.
Measuring total transmitted power while varying incident photon energy spectrum.
Analyzing the observed transmission characteristics for evidence of photon blockade.

Main Results:

Demonstrated nonresonant photon-photon interactions leading to photon blockade.
Observed a four-step staircase in transmitted power, analogous to Coulomb blockade.
Maintained photonic nature of cavity-qubit excitations, distinct from hybridization.

Conclusions:

The study successfully realized and characterized dispersive photon blockade in a superconducting circuit.
The observed phenomenon provides a new avenue for controlling photon transport.
The system's tolerance to disorder opens possibilities for advanced condensed matter research.