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Landau-Zener-Stückelberg Interferometry for Majorana Qubit
Zhi Wang1,2, Wen-Chao Huang1, Qi-Feng Liang2,3
1School of Physics, Sun Yat-sen University, Guangzhou, 510275, China.
Scientific Reports
|May 23, 2018
Summary
We propose manipulating Majorana qubits using quantum tunneling in topological superconductors. This method utilizes Landau-Zener-Stückelberg interference for arbitrary control of Majorana parity states.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
- Nanotechnology
Background:
- Topological superconductors host Majorana quasiparticles (MQs) at their ends.
- Previous experiments have observed superconducting states with even/odd electron numbers, consistent with MQs.
Purpose of the Study:
- To propose a method for manipulating Majorana qubits.
- To exploit quantum tunneling effects for qubit control.
Main Methods:
- Utilizing a prototype setup with two coupled 1D topological superconductors.
- Controlling the tunneling junction via gate voltage.
- Applying voltage bias to induce superconducting phase difference and energy level oscillations.
Main Results:
- Demonstrated Landau-Zener-Stückelberg (LZS) interference between Majorana parity states.
- Showed that avoided level-crossing due to MQ coupling enables LZS interference.
- Proposed pulse sequences for bias and gate voltages to construct LZS interferometry.
Conclusions:
- Arbitrary manipulation of Majorana qubits is achievable.
- LZS interferometry offers a viable pathway for topological quantum computing with Majorana qubits.
