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Ramsey-biased spectroscopy of superconducting qubits under dispersion
- Source :
- Phys. Rev. A 102, 013710 (2020)
- Publication Year :
- 2020
-
Abstract
- We proposed a spectroscopic method that extends Ramsey's atomic spectroscopy to detect the transition frequency of a qubit fabricated on a superconducting circuit. The method uses a multi-interval train of qubit biases to implement an alternate resonant and dispersive couplings to an incident probe field. The consequent absorption spectrum of the qubit has a narrower linewidth at its transition frequency than that obtained from constantly biasing the qubit to resonance while the middle dispersive evolution incurs only a negligible shift in detected frequency. Modeling on transmon qubits, we find that the linewidth reduction reaches 23% and Ramsey fringes are simultaneously suppressed at extreme duration ratio of dispersion over resonance for a double-resonance scheme. If the scheme is augmented by an extra resonance segment, a further 37% reduction can be achieved.
- Subjects :
- Quantum Physics
Physics - Optics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 102, 013710 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2004.08188
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.102.013710