Skip to content

An efficient quantum photonic phase shift in a low Q-factor regime

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalACS Photonics
Issue number2
DateAccepted/In press - 11 Jan 2019
DatePublished (current) - 11 Jan 2019


Solid-state quantum emitters have long been recognized as the ideal platform to realize integrated quantum photonic technologies. We demonstrate that a self-assembled negatively charged quantum dot (QD) in a low Q-factor photonic micropillar is a suitable design for deterministic polarization switching and spin-photon entanglement. We show this by measuring a shift in phase of an input single photon of at least 2π/3. As we explain in the text, this is strong experimental proof that input photons can interact with the emitter deterministically. A deterministic photon-emitter interaction is a viable and scalable means to achieve several vital functionalities such as single photon switches and entanglement gates. Our experimentally determined value is limited by mode mismatch between the input laser and the cavity, QD spectral fluctuations, and spin relaxation. When on-resonance we estimate that up to ∼80% of the collected photons couple into the cavity mode and have interacted with the QD and undergone a phase shift of π.

    Research areas

  • quantum dot, cavity QED, micropillar cavity

Download statistics

No data available



  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via ACS Publications at Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 646 KB, PDF document


View research connections

Related faculties, schools or groups