A silicon-based single-electron interferometer coupled to a fermionic sea
2018
We study Landau-Zener-Stuckelberg-Majorana (LZSM) interferometry under the influence of projective
readout using a charge qubit tunnel-coupled to a fermionic sea. This allows us to characterize the coherent
charge-qubit dynamics in the strong-driving regime. The device is realized within a silicon complementary
metal-oxide-semiconductor (CMOS) transistor. We first read out the charge state of the system in a continuous
nondemolition manner by measuring the dispersive response of a high-frequency electrical resonator coupled to the
quantum system via the gate. By performing multiple fast passages around the qubit avoided crossing, we observe
a multipassage LZSM interferometry pattern. At larger driving amplitudes, a projective measurement to an evenparity
charge state is realized, showing a strong enhancement of the dispersive readout signal. At even larger driving
amplitudes, two projective measurements are realized within the coherent evolution resulting in the disappearance
of the interference pattern. Our results demonstrate a way to increase the state readout signal of coherent quantum
systems and replicate single-electron analogs of optical interferometry within a CMOS transistor.
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