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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics Année : 2016

Manipulating Fock states of a harmonic oscillator while preserving its linearity

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Résumé

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.
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Dates et versions

cea-01346391 , version 1 (18-07-2016)
cea-01346391 , version 2 (26-05-2017)

Identifiants

Citer

Kristinn Juliusson, Simon Bernon, Xin Zhou, Vivien Schmitt, Hélène Le Sueur, et al.. Manipulating Fock states of a harmonic oscillator while preserving its linearity. Physical Review A : Atomic, molecular, and optical physics, 2016, 94 (6), pp.063861. ⟨10.1103/PhysRevA.94.063861⟩. ⟨cea-01346391v2⟩
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