Noise-correlation spectrum for a pair of spin qubits in silicon

Understand

Semiconductor qubits are appealing for building quantum processors as they may be densely integrated due to small footprint.

• However, a high density raises the issue of noise correlated across different qubits, which is of practical concern for scalability and fault tolerance.
• Here, we analyse and quantify in detail the degree of noise correlation in a pair of neighbouring silicon spin qubits ~100 nm apart.
• We evaluate all a-priori independent auto- and cross- power spectral densities of noise as a function of frequency.