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Interferometric single-shot parity measurement in InAs-Al hybrid devices
, Morteza Aghaee1, Alejandro Alcaraz Ramirez1
1Microsoft Azure Quantum, Redmond, WA, USA.
Nature
|February 19, 2025
Summary
Researchers developed a new device for measuring fermion parity in topological superconductors, crucial for quantum computation. This advancement enables precise parity determination, paving the way for topological quantum computing.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
Background:
- Non-Abelian anyon fusion is key to measurement-only topological quantum computation.
- In 1D topological superconductors, fusion determines the shared fermion parity of Majorana zero modes (MZMs).
Purpose of the Study:
- Introduce a device architecture for testing fusion rules.
- Implement a single-shot interferometric measurement of fermion parity.
Main Methods:
- Utilized indium arsenide-aluminium heterostructures with a gate-defined superconducting nanowire.
- Created an interferometer by tunnel-coupling the nanowire to quantum dots.
- Measured quantum capacitance shifts induced by the nanowire.
Main Results:
- Demonstrated state-dependent quantum capacitance shifts up to 1 fF.
- Observed h/2e-periodic bimodality with an SNR of 1 in 3.6 μs.
- Extracted dwell times exceeding 1 ms at ~2 T magnetic fields.
- Achieved a parity measurement assignment error probability of 1%.
Conclusions:
- The device architecture is compatible with future fusion rule tests.
- The large capacitance shift and long poisoning time facilitate accurate parity measurements.
- Measurements can be interpreted in both topologically trivial and non-trivial contexts.
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