Altermagnetic semiconductors are proposed as a platform for all-electrically controlled spin qubits in gate-defined quantum dots, enabling local frequency tunability without external magnetic fields or micromagnets. The momentum-dependent spin splitting, tied to a fixed altermagnetic quantization axis, longitudinally suppresses electric-field noise at leading order, causing relaxation rather than pure dephasing.
fSim Altermagnetic Quantum Dots Shield Qubits From Electric Noise
Altermagnetic semiconductors are proposed as a platform for all-electrically controlled spin qubits in gate-defined quantum dots, enabling local frequency tunability without external magnetic fields or micromagnets. The momentum-dependent spin splitting, tied to a fixed altermagnetic quantization axis, longitudinally suppresses electric-field noise at leading order, causing relaxation rather than pure dephasing.