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Journal articles
Manipulating Fock states of a harmonic oscillator while preserving its linearity
Abstract : We present a scheme for controlling the quantum state of a harmonic oscillator by coupling it to an anharmonic multilevel system (MLS) with first- to second-excited-state transition on resonance with the oscillator. In this scheme, which we call ef-resonant, the spurious oscillator Kerr nonlinearity inherited from the MLS is very small, while its Fock states can still be selectively addressed via an MLS transition at a frequency that depends on the number of photons. We implement this concept in a circuit-QED setup with a microwave three-dimensional cavity (the oscillator, with frequency 6.4 GHz and quality factor QO=2×10 6) embedding a frequency tunable transmon qubit (the MLS). We characterize the system spectroscopically and demonstrate selective addressing of Fock states and a Kerr nonlinearity below 350 Hz. At times much longer than the transmon coherence times, a nonlinear cavity response with driving power is also observed and explained.
Cited literature [22 references]
https://hal-mines-paristech.archives-ouvertes.fr/cea-01346391
Contributor : François Chaplais <>
Submitted on : Friday, May 26, 2017 - 11:31:55 PM
Last modification on : Tuesday, January 12, 2021 - 6:00:03 PM
Long-term archiving on: : Monday, August 28, 2017 - 5:10:42 PM
Contributor : François Chaplais <>
Submitted on : Friday, May 26, 2017 - 11:31:55 PM
Last modification on : Tuesday, January 12, 2021 - 6:00:03 PM
Long-term archiving on: : Monday, August 28, 2017 - 5:10:42 PM
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1607.05204.pdf
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