Seminar Series

The application of cryogenic rare earth ion dopants for quantum information and biomedical imaging


Dr Jevon Longdell


Department of Physics, Otago University

Time & Place

Sat, 01 Apr 2017 11:00:00 NZDT in Rutherford 701, Level 7

All are welcome


In this talk I will cover some of the applications of cryogenic rare earths that we are investigating at Otago.

1. Using rare earth based filters for ultrasound modulated optical tomography (UMOT). UMOT requires that sideband light, produced by ultrasound, be separated from the unshifted carrier light. This is challenging because both light fields are highly scattered and the frequency shifts (given by the ultrasound frequencies) are small. We chose to tackle this problem using filters borrowed from research into optical quantum memories. With this we showed a record selectivity between carrier and side band light. I will also show our first imaging efforts.

2. Upconverting microwave to optical photons. Superconducting qubits are exciting systems for quantum information. However the microwave photons that they couple to get swamped by thermal noise unless at milli-Kelvin temperatures. Converting microwave photons to optical photons in a way that preserves the encoded quantum states would solve this problem. I will outline our proposal for achieving this conversion using rare earth ion dopants and present some experimental results.