Ramsey-biased spectroscopy of superconducting qubits under dispersion
- URL: http://arxiv.org/abs/2004.08188v1
- Date: Fri, 17 Apr 2020 11:45:28 GMT
- Title: Ramsey-biased spectroscopy of superconducting qubits under dispersion
- Authors: Yan Zhang, Tiantian Huan, Ri-gui Zhou, Hou Ian
- Abstract summary: We propose a spectroscopic method that extends Ramsey's atomic spectroscopy to detect the transition frequency of a qubit fabricated on a superconducting circuit.
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.
- Score: 4.084386364789571
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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.
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