Electromagnetically induced transparency in superconducting quantum circuits: Effects of decoherence, tunneling, and multilevel crosstalk
Zachary Dutton, K. V. R. M. Murali, William D. Oliver, T. P. Orlando
DOI 10.1103/PhysRevB.73.104516 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We explore theoretically electromagnetically induced transparency (EIT) in a superconducting quantum circuit (SQC). The system is a persistent-current flux qubit biased in a Λ configuration. Previously [Phys. Rev. Lett. 93, 087003 (2004)], we showed that an ideally prepared EIT system provides a sensitive means to probe decoherence. Here, we extend this work by exploring the effects of imperfect dark-state preparation and specific decoherence mechanisms (population loss via tunneling, pure dephasing, and incoherent population exchange). We find an initial, rapid population loss from the Λ system for an imperfectly prepared dark state. This is followed by a slower population loss due to both the detuning of the microwave fields from the EIT resonance and the existing decoherence mechanisms. We find analytic expressions for the slow loss rate, with coefficients that depend on the particular decoherence mechanisms, thereby providing a means to probe, identify, and quantify various sources of decoherence with EIT. We go beyond the rotating wave approximation to consider how strong microwave fields can induce additional off-resonant transitions in the SQC, and we show how these effects can be mitigated by compensation of the resulting ac Stark shifts.
Similar papers
Electromagnetically induced transparency in superconducting quantum circuits : Effects of decoherence, tunneling and multi-level cross-talk
similarity 0.90Zachary Dutton et al. · 2006 · arXiv:cond-mat/0604104
Source status unknown — claims are unverified
Tunneling probe of fluctuating superconductivity in disordered thin films
similarity 0.89David Dentelski et al.
Source status unknown — claims are unverified
Decoherence processes in a current biased dc SQUID
similarity 0.89J. Claudon et al.
Source status unknown — claims are unverified
Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit
similarity 0.89Zijun Chen et al.
Source status unknown — claims are unverified
Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
similarity 0.89Clemens Müller et al.
Source status unknown — claims are unverified