On-chip characterisation of continuous variable states using balanced homodyne detection

Lead Research Organisation: University of Bristol
Department Name: Physics


An attractive platform for continuous variable information processing is in silicon, an already
well developed technology for integrated electronic circuits. Furthermore, silicon allows the
use of telecoms band laser sources and detectors. A common means of characterising
continuous variable states is through balanced homodyne detection; referencing to a
classical light source allows measurement of truly quantum properties of light.
Recent work in the group has demonstrated balanced homodyne detection with integrated
detectors in silicon, including Gbps quantum random number generation passing all NIST
statistical tests. The aims of this project include characterising photon states using balanced homodyne
detection, heralded on single photon detection. This PhD will seek to demonstrate this can be achieved in
silicon photonics and go beyond by performing multi-rail tomography, with the next step starting with heralded
qu-trits encoded on single photons in three modes. In parallel the student will develop the bandwidth and shot noise
clearance of the electronics used for homodyne detection, with applications including certifiable quantum random
number generation on-chip.


10 25 50

Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/R51245X/1 30/09/2017 31/12/2022
1933084 Studentship EP/R51245X/1 17/09/2017 30/03/2022 Jonathan Frazer