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Simulated Majorana states

Objective

Quantum computation using topologically protected Majorana bound states is a promising direction towards scalable quantum architectures due to their inherent noise immunity provided by the nonlocal storage of quantum information. Thus far, Majorana states have mostly been investigated in superconductor-semiconductor heterostructures which rely on induced superconductivity in a quasi-one-dimensional conductor. However, despite tremendous efforts in material development, these devices are still limited by uncontrolled local fluctuations due to disorder and it is unclear if future developments will solve these problems. Furthermore, disorder may even mimic the transport signatures of topological ordering, hindering an unambiguous identification of the Majorana states.
Here I propose a way to overcome these limitations: I will work towards the direct quantum simulation of the one dimensional topological superconductor with Majorana bound states. I will use chains of semiconductor quantum dots, which is an emerging platform to simulate exotic many-body electron states. Building on this platform, I will be able to demonstrate for the first time the emergence of coherent, non-local superconducting states bound to the entire device similarly to the Kitaev chain model of topological superconductivity.
To demonstrate quantum coherence of the chain, we will build the first Andreev molecule quantum bit, which, while not topologically protected, will already combine advantages of superconducting and semiconductor qubits. Going one step further, we will investigate the simulated Kitaev chain. Upon establishing the presence of the simulated Majorana states, we will work towards a simple braiding protocol to demonstrate the non-Abelian nature of the edge modes.
This research direction, combining the scalability of semiconductor structures and the topological protection of Majorana states, will open new avenues towards universal quantum computation.

Field of science

  • /natural sciences/physical sciences/electromagnetism and electronics/electrical conductivity/semiconductor
  • /natural sciences/physical sciences/electromagnetism and electronics/electrical conductivity/superconductor

Call for proposal

ERC-2018-STG
See other projects for this call

Funding Scheme

ERC-STG - Starting Grant

Host institution

CHALMERS TEKNISKA HOEGSKOLA AB
Address
-
41296 Goeteborg
Sweden
Activity type
Higher or Secondary Education Establishments
EU contribution
€ 1 926 263

Beneficiaries (2)

CHALMERS TEKNISKA HOEGSKOLA AB
Sweden
EU contribution
€ 1 926 263
Address
-
41296 Goeteborg
Activity type
Higher or Secondary Education Establishments
TECHNISCHE UNIVERSITEIT DELFT

Participation ended

Netherlands
EU contribution
€ 71 250
Address
Stevinweg 1
2628 CN Delft
Activity type
Higher or Secondary Education Establishments