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Coherent Control of Collective Spontaneous Emission through Self-Interference
Lei Qiao1, Jiangbin Gong1,2
1Department of Physics, National University of Singapore, Singapore 117551, Singapore.
Physical Review Letters
|September 9, 2022
Summary
Researchers demonstrate controllable superradiance and subradiance in quantum systems using a novel self-interference mechanism. This method manipulates collective emission rates in nonlinear waveguides, offering new possibilities for quantum optics control.
Area of Science:
- Quantum Optics
- Condensed Matter Physics
- Quantum Information Science
Background:
- Collective spontaneous emission, including superradiance, is a fundamental phenomenon in quantum optics.
- Existing systems have demonstrated superradiance, but coherent control over emission rates remains a challenge.
- Nonlinear waveguide settings offer potential for novel quantum phenomena and control mechanisms.
Purpose of the Study:
- To propose an innovative scheme for coherent control of collective emission rates.
- To investigate a self-interference mechanism in a nonlinear waveguide for manipulating quantum emission.
- To explore the realization of controllable superradiance and subradiance using quantum scatterers.
Main Methods:
- Utilizing a nonlinear waveguide setting with quantum scatterers acting as quantum switches.
- Employing photon backward scattering to induce a self-interference mechanism.
- Analyzing the dependence of interference (constructive/destructive) on the distance between scatterers and emitters.
Main Results:
- Demonstrated controllable superradiance and subradiance through photon self-interference.
- Achieved significant enhancement or suppression of collective decay rates, leading to hyperradiance or population trapping.
- Observed an abrupt, real-time change in emission rates, confirming the self-interference mechanism.
Conclusions:
- The proposed self-interference mechanism provides a novel pathway for coherent control of collective emission rates.
- The scheme is experimentally feasible, with a proposed setup using superconducting transmission line resonators and transmon qubits.
- This work opens avenues for advanced quantum control in quantum optics and quantum information processing.
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