Journal
PHYSICAL REVIEW APPLIED
Volume 10, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.10.044030
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Funding
- Intelligence Advanced Research Projects Activity LogiQ program [W911NF-16-1-0114-FE]
- Army Research Office [W911NF-14-1-0124]
- Swiss National Science Foundation [150046]
- European Commission Marie Curie European Training Network QuSCo [765267]
- Marie Curie Actions (MSCA) [765267] Funding Source: Marie Curie Actions (MSCA)
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Increasing coherence times of quantum bits is a fundamental challenge in the field of quantum computing. With long-lived qubits it is, however, inefficient to wait until the qubits have relaxed to their ground state after completion of an experiment. Moreover, for error-correction schemes it is important to rapidly reinitialize syndrome qubits. We present a simple pulsed qubit reset protocol based on a two-pulse sequence. A first pulse transfers the excited-state population to a higher excited qubit state and a second pulse transfer it into a lossy environment provided by a low-Q transmission-line resonator, which is also used for qubit read-out. We show that the remaining excited-state population can be suppressed to (1.7 +/- 0.1)% and that this figure may be reduced by further improving the pulse calibration.
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