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Story summary
- Researchers improved spin qubit readout in semiconductor quantum dots (QDs) by adding third quantum dot coupled to a charge reservoir.
- The method uses a cascaded charge effect under radio frequency excitation to boost the signal-to-noise ratio.
- The approach achieves a minimum integration time of 7.6 microseconds and a readout fidelity of 67%, with strategies identified to reach 99%.
- The readout remains non-demolition, leaving the system in an eigenstate after measurement.
