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Observation of the Unconventional Photon Blockade.
H J Snijders1, J A Frey2, J Norman3
1Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands.
Researchers observed unconventional photon blockade in quantum dot cavity quantum electrodynamics (QED) operating in the weak coupling regime. This effect, distinct from conventional photon blockade, was achieved by coupling a single quantum dot to two polarized cavity modes.
Area of Science:
- Quantum optics
- Cavity quantum electrodynamics (QED)
- Solid-state quantum emitters
Background:
- Photon blockade is crucial for quantum information processing, typically requiring strong coupling regimes.
- Unconventional photon blockade offers potential advantages by operating in weaker coupling regimes.
Purpose of the Study:
- To investigate and demonstrate the unconventional photon blockade effect in a quantum dot cavity QED system.
- To explore the role of polarization in achieving this effect.
Main Methods:
- Utilizing a single quantum dot transition coupled to two orthogonally polarized optical cavity modes.
- Precisely tuning input and output polarization states.
Main Results:
- Observed unconventional photon blockade in the weak coupling regime.
- Measured a minimum second-order correlation g^(2)(0) of approximately 0.37 (0.005 corrected for detector jitter).
- Confirmed polarization dependency and observed photon bunching/antibunching, indicating a transition from phase to amplitude squeezing.
Conclusions:
- Unconventional photon blockade is achievable in weakly coupled quantum dot cavity QED systems.
- Polarization control is a key parameter for observing and manipulating this effect.
- The observed phenomena suggest potential for novel quantum optical devices.
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