Silicon double quantum dot device technologies for spin-based quantum information processing applications via spin-blockade

Lead Research Organisation: University of Southampton
Department Name: Electronics and Computer Science


Using unique silicon double quantum dot devices, as well as other novel QD devices currently under fabrication, one objective is to observe Spin-Blockade, and therefore demonstrate that spin can be manipulated and controlled in these devices, with the ambition of benchmarking our devices in spin-blockade electron transport applications, in collaboration with RIKEN Institute. Then, building on this, another project objective is to explore electron spin interactions between quantum dots to gain a deeper understanding of the coupling between states, in collaboration with industrial partner Hitachi-Cambridge Laboratory on the development of spin-qubit devices.

Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/R512187/1 30/09/2017 29/09/2021
1952186 Studentship EP/R512187/1 30/09/2017 30/11/2021 Joseph Hillier
Description The quantum devices investigated as part of this work led to publications which will benefit future quantum computing research as well as bridging the gap between the fabrication of industry compatible and novel research devices.
Exploitation Route One key insight is from the use of defects (present in silicon transistors fabricated by industrial foundries) to control single charges for quantum information applications. This means that the expensive and intensive fabrication processes to produce novel quantum devices may not be needed if defects present in ordinary silicon devices can function as a quantum device under the correct circumstances.
Sectors Digital/Communication/Information Technologies (including Software),Electronics,Energy,Manufacturing, including Industrial Biotechology

Description Manufacturing Quantum Nano-LEGO Blocks for Electronics, Photonics, and Phononics Integrated Systems
Amount £1,095,170 (GBP)
Funding ID EP/M008975/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Public
Country United Kingdom
Start 03/2015 
End 03/2020
Description The RIKEN Institute 
Organisation RIKEN
Department RIKEN Chief Scientist Laboratories
Country Japan 
Sector Private 
PI Contribution For this collaboration our group provided silicon-nanowire devices and well as silicon transistors which were measured jointly.
Collaborator Contribution Ono-san at the Advanced device laboratory provided teaching on how to prepare samples for measurement as well as a operate a liquid helium cryostat. Consumables were also provided in the form of liquid helium refills, sample holders and low temperature conducting paste. As Ono-san is an expert in the field of single spin sensing using quantum dots and a pioneer of spin-blockade, he also provided valuable expertise on measurement protocols on how to detect magnetic field dependant phenomenon and spin related artefacts. These measurement protocols are now being used at Southampton to study spin blockade of double quantum dots and single charge traps.
Impact One output is how Well voltage can be used to tune a device in order for spin-blockade to occur in a silicon double quantum dot transistor. This novel approach is currently being drafted as a paper to be submitted to an IOP journal.
Start Year 2018