Quantum computation using a photonic platform requires fast switches to implement phase control in quantum processing circuits. Two common mechanisms for phase control in silicon photonics are thermo-optic and carrier depletion effects, each with their own advantages and drawbacks. The electro-optic Kerr effect provides an alternative phase-shifting mechanism in silicon that has been demonstrated using telecom wavelengths (Chakraborty, 2020). Here, we present devices with wider active-region waveguides to reduce insertion loss and have the added advantage of lower two-photon loss by using wavelengths in the mid-infrared (Rosenfeld, 2020). We demonstrate electro-optic phase shifts over a 60 nm band in the mid-infrared using devices with novel, wider waveguide geometries greater than or equal to 1 micron in width.

The Electro-Optic Kerr Effect in
the Mid-Infrared using Wide Silicon
Waveguides

Poster session 1 & networking on Gathertown

poster

**BQIT is a three day annual workshop** aimed at enabling leading UK and international academics and industrial partners to come together; to explore and discuss future ambitions and challenges in the field of **Quantum Information Technologies.** Since our conception in 2014 we have had 230 speakers and panellists who have presented their work and opinions on a range of topics, from quantum theory to innovation in industry.


### Welcome Message
The BQIT:21 team welcomes you to the eighth Bristol Quantum Information Technologies workshop! 

Last year was the first time in our workshop's history that we had gone fully virtual. The global circumstances that continue to impact us all professionally and personally have forced BQIT once again to be delivered as an all-virtual workshop for 2021. The access this creates to colleagues across the world who would otherwise be unable to join us, as well as being able to make the workshop free for all attendees due to the lower costs involved in delivering an online workshop, are just a couple of the extraordinary benefits of meeting online. This also means that we can welcome three times as many attendees to BQIT than previous years.   

We take this opportunity to thank each of our speakers and poster presenters for contributing their technical content, this year's sponsors, whose support this year enabled BQIT:21 to be free to all attendees, and to all of our attendees for joining us online this year. We recognise the extra energy required to stay connected and motivated during these difficult times, and are hugely encouraged to see so many of you willing to continue to connect with us on an online platform. 

It is our hope that you have a productive and enjoyable time while you engage and interact with BQIT:21, and to everyone that has helped take BQIT:21 online, thank you! 

**The BQIT board and organisation team **


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### This year's workshop agenda is available here: [Virtual BQIT:21](https://drive.google.com/file/d/1QwsSM0ztnxC_lgUKf3TbO3GvnI44AQkY/view?usp=sharing)
For further information, please contact us at: **bqit-admin@bristol.ac.uk**

![](https://assets.underline.io/uploads/markdown_image/1/image/a12e0c1ad3410144cb48557690e4ecaf.png)

Marija Radulovic

1

Presentations

The Electro-Optic Kerr Effect in the Mid-Infrared using Wide Silicon Waveguides

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