研究目的
Investigating the use of SWAP gates for coherent transfer of quantum information in silicon double quantum dots to overcome limited qubit-to-qubit connectivity.
研究成果
The research demonstrates a resonant SWAP gate capable of high-fidelity transfer of spin eigenstates and arbitrary two-qubit states in silicon quantum dots. This advancement paves the way for beyond nearest-neighbor operations in quantum dot arrays, essential for scaling up quantum information processing.
研究不足
The study is limited by the dynamic range of control electronics, which restricts the minimum SWAP time. Additionally, the fidelity of the coherent-SWAP gate is affected by time-dependent fluctuations in magnetic field gradients or exchange interaction.
1：Experimental Design and Method Selection:
The study employs a resonant SWAP gate for transferring spin eigenstates and arbitrary two-qubit product states in a silicon double quantum dot. The methodology includes the use of electric dipole spin resonance for single-spin control and an on-chip micromagnet for site-selective control.
2：Sample Selection and Data Sources:
The experiment uses two sites of a quadruple quantum dot fabricated on a 28Si/SiGe heterostructure, with qubits accumulated under plunger gates P3 and P
3：List of Experimental Equipment and Materials:
The setup includes a quadruple quantum dot device, microwave signal generators for qubit control, and charge sensors for state readout.
4：Experimental Procedures and Operational Workflow:
The protocol involves initializing the qubits, applying the SWAP gate, and measuring the state through spin-selective tunneling. The process is repeated for various input states to assess fidelity.
5：Data Analysis Methods:
The fidelity of the SWAP gate is evaluated using state tomography and Clifford randomized benchmarking, with data analysis focusing on decay parameters and state fidelity.
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