Single-photon emitting diode based on a quantum dot in a micro-pillar.
1Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, UK. Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK.
Nanotechnology
|July 7, 2011
Summary
We developed a single-photon diode using quantum dots in a micro-pillar cavity. This device achieves efficient single-photon emission, confirmed by photon anti-bunching measurements.
Area of Science:
- Quantum optics
- Solid-state physics
- Nanophotonics
Background:
- Single-photon sources are crucial for quantum technologies.
- Quantum dots offer tunable optical properties for light emission.
- Micro-pillar cavities enhance light-matter interactions.
Purpose of the Study:
- To fabricate and characterize a single-photon emitting diode.
- To demonstrate efficient single-photon emission from a quantum dot device.
- To investigate the performance of the device for quantum applications.
Main Methods:
- Fabrication of a quantum dot in a micro-pillar cavity.
- Temperature tuning of quantum dot emission into cavity resonance.
- Electroluminescence and autocorrelation measurements.
Main Results:
- Enhanced collected photon intensity at 40 K when dot emission is resonant with the cavity mode.
- Observation of photon anti-bunching in electroluminescence, indicating single-photon emission.
- Achieved g((2))(0) = 0.17 due to low device resistance and capacitance enabling short current pulses.
Conclusions:
- The fabricated device functions as an efficient single-photon source.
- The quantum dot micro-pillar cavity design enhances photon collection.
- The device shows potential for practical quantum information processing applications.
