4-Year Colloquium: Johannes Fink

Quantum microwave photonics: optical interfaces, entanglement and remote sensing

Superconducting electrical circuits represent one of the most promising platforms for quantum computation and simulation. They can be integrated on-chip with standard top-down fabrication methods and controlled on nanosecond time-scales using microwave photons. Photons at optical wavelengths on the other hand, are the best candidates for establishing quantum networks due to their weak interaction with the environment and resilience to thermal noise. Finding a way to efficiently interface these two domains is one of the most exciting areas of experimental physics today.

In this talk we will summarize our recent progress in the emerging field of quantum microwave photonics. The interplay between parametric driving, interference and dissipation in cavity optomechanics and cavity electrooptics can be used to break time-reversal symmetry [1], realize bidirectional microwave to telecom conversion [2,3] or to deterministically entangle itinerant microwave modes [4]. Stationary entanglement is an important resource for quantum communication [5] and quantum enhanced detection protocols such as quantum illumination [6]. We will also briefly review our approach [7] to developing the non-Gaussian resources needed for future fault tolerant quantum processors and error corrected quantum networks.

[1] S. Barzanjeh, et al., Nature Communication 9, 953 (2017)
[2] G. Arnold*, M. Wulf*,et al. Nature Communication (in print)
[3] W. Hease*, A. Rueda*, et al. arXiv:2005.12763
[4] S. Barzanjeh, et al. Nature 570, 480 (2019)
[5] A. Rueda, et al. npj Quantum Information 5, 108 (2019)
[6] S. Barzanjeh, et al. Science Advances 6, eabb0451 (2020)
[7] M. Peruzzo*, A. Trioni*, et al. arXiv:2007.01644

If you would like to attend the talk on-site (Raiffeisen Lecture Hall) please register here (registration is mandatory). A Zoom link will also be sent out before the talk.