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Generation of pure quantum light in the solid-state

April 5, 2021 - 11:00am
Speaker: 
Pascale Senellart
Institution: 
CNRS, Univ. Paris-Sud, Université Paris-Saclay

The ability to generate light in pure quantum states is central to the development of quantum-enhanced technologies. Recently, artificial atoms in the form of semiconductor quantum dots have emerged as an excellent platform for quantum light generation [1]. By placing the quantum dot in an optical microcavity, pure dephasing phenomena are strongly suppressed and single photon wavepackets with very high quantum purity in the frequency domain are generated [2]. This is obtained at high efficiency, which opens new possibilities for optical quantum protocols such as the resource efficient generation of linear cluster states [3].

We recently revisited the Hong-Ou-Mandel interference of indistinguishable photons to better understand the effects of imperfect purity [4] and explored new schemes to push further the source efficiency [5]. Interestingly, this last study shows that we can turn the emitter imperfections and its coupling the solid-state environment into resources.

 Finally, this high-quality artificial atom-photon interface allows us to investigate fundamental quantum optics. We recently demonstrated that the coherence imprinted at the atomic level can be transferred to the radiated field through spontaneous emission. We report on  the direct generation of light pulses in a pure quantum superposition of vacuum and one-photon with a full control of their relative populations and phase [6].

[1] P Senellart, G Solomon, A White, Nature Nanotechnology 12 (11), (2017)

[2] N. Somaschi, et al. Nature Photonics, 10, 340 (2016)

[3] D. Istrati et al. Nature Communications 11, 5501 (2020)

[4] H. Ollivier et al., Phys. Rev. Lett. 126, 063602 (2021)

[5] S. Thomas et al. arXiv:2007.04330

[6] J. C. Loredo, C. Anton, et. al, Nature Photonics 13, 803 (2019)

We are hosting the Spring 2021 JQI Seminars virtually as Zoom meetings. JQI members and affiliates will receive a Zoom link in an email announcing each seminar. For those without access to Zoom, we will also be live streaming each seminar on YouTube. Once a seminar starts, you will find a link to the live stream on our YouTube page at https://www.youtube.com/user/JQInews(link is external)(link is external)(link is external)(link is external).

 
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