Big congrats to Matilda for successfully defending her PhD thesis on “Geometric superinductors and their applications in circuit quantum electrodynamics“.

A big THANK YOU to all speakers and CONGRATS to our Rishabh Sahu who won the poster cash prize for his contribution: “Quantum-enabled microwave optical interface with unity internal efficiency”.

Nice outreach piece summarizing our two recent results on optical interfaces for superconducting quantum processors at IST Austria News.

G. Arnold*, M. Wulf*, S. Barzanjeh, E. S. Redchenko, A. Rueda, W. J. Hease, F. Hassani, and J. M. Fink. 2020. Converting microwave and telecom photons with a silicon photonic nanomechanical interface. Nature Communications. DOI: 10.1038/s41467-020-18269-z

William Hease*, Alfredo Rueda*, Rishabh Sahu, Matthias Wulf, Georg Arnold, Harald G. L. Schwefel, and Johannes M. Fink. 2020. Bidirectional Electro-Optic Wavelength Conversion in the Quantum Ground State. PRX Quantum. DOI: 10.1103/PRXQuantum.1.020315

We are witnessing rapid progress in the fields of quantum computing with superconducting circuits on the one hand, and long-distance optical quantum communication on the other. Meanwhile, there is currently no solution to interface these two domains of quantum technology in analogy to fiber optic modems in classical communication systems. Apart from close to unity efficiency and high bandwidth, such a quantum interface also needs to operate close to its quantum ground state with hardly any excess noise on either the electrical or the optical output—an important milestone that we demonstrate in this work.

We realize the electro-optic wavelength converter based on a mechanically polished crystalline lithium niobate whispering gallery mode resonator. In contrast to traditional modulators, the interaction is resonantly enhanced using a superconducting microwave cavity that matches the free spectral range and leads to an extremely efficient bidirectional conversion process. We show that this conversion works well despite the relatively high optical pump powers required. The microwave mode remains close to the quantum ground state at millikelvin temperatures where superconducting qubits operate.

The centimeter-sized device benefits from a large heat capacity and a good thermalization to the cold environment, resulting in an extremely slow observed heating rate compared to on-chip devices. Based on this, we estimate that pulsing the pump can boost the conversion efficiency by another 4 orders of magnitude without a significant increase of added noise. This would open the way for long-distance quantum networks utilizing superconducting processors for secure communication and distributed quantum computing.

Bidirectional electro-optic wavelength conversion in the quantum ground state
W. Hease*, A. Rueda*, R. Sahu, M. Wulf, G. Arnold, H. G. L. Schwefel, J. M. Fink.
PRX Quantum 1, 020315 (2020)
PRXQ, arXiv

In superconducting circuits, superinductors are employed to suppress charge fluctuations and increase zero-point voltage, enabling features for hardware-protected qubits, metrological standards, and strongly coupled hybrid devices. Conventionally these devices are based on kinetic inductance, and can suffer from nonlinearity, additional complexity due to multiterminal structure, and the limited control and reliability of bottom-up fabrication. Making use of miniaturization and substrate engineering, the authors realize a geometrically defined, single-wavefunction superinductor—a high-performance, innovative circuit element that promises to expand the scope of quantum circuitry.

Surpassing the resistance quantum with a geometric superinductor
M. Peruzzo*, A. Trioni*, F. Hassani, M. Zemlicka, J. M. Fink
Phys. Rev. Applied 14, 044055 (2020)

News coverage: Geometric Inductor Breaks Resistance Quantum “Limit” Physics 13, 141 (2020)

Adrian Cho gives an accurate and realistic account of quantum radar in Science Magazine today.

Our new paper shows chip-scale transduction of microwave and optical photons via radiation pressure at mK temperature. It achieves the lowest V_π to date and we carefully analyze and model the conversion noise that currently hinders using it for quantum applications in continuous wave mode.
Big thanks to the team around Georg, Matthias and Shabir as well as our funders: (ERC, HOΤ and IST)!

Converting microwave and telecom photons with a silicon photonic nanomechanical interface
G. Arnold*, M. Wulf*, S. Barzanjeh, E. S. Redchenko, A. Rueda, W. J. Hease, F. Hassani, J. M. Fink.
Nature Commun. 11 4460 (2020)

Together with Nicholas Lambert and Harald Schwefel we are organizing a WE-Heraeus-Seminar next spring with a great selection of confirmed speakers (to be completed).

When: 30 May – 03 Jun 2021
Where: Physikzentrum Bad Honnef

Our proof of principle demonstration of quantum radar is out now. It shows that an entangled source of microwave radiation can result in a relative object detection advantage compared to a classically correlated noise source.
Science Advances 6 eabb0451 (2020)
ScienceAdvances, arXiv, MIT TechReview, PhysOrg, APA

Alfredo made it to the cover of our new institute annual report in his last week at IST before moving on to Scantinel Photonics. We are sad and wish him good luck!