MINES ParisTech CAS - Centre automatique et systèmes

Manipulating Fock states of a harmonic oscillator while preserving its linearity

Authors: K. Juliusson, S. Bernon, X. Zhou, V. Schmitt, H. le Sueur, P. Bertet, D. Vion, M. Mirrahimi, P. Rouchon, D. Esteve, Physical Review A, Vol 94, 063861, 29 December 2016, DOI: 10.1103/PhysRevA.94.063861
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=2×106) 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.
Download PDF
BibTeX
@Article{2017-05-26,
author = {S. Bernon K. Juliusson, X. Zhou, V. Schmitt, H. le Sueur, P. Bertet, D. Vion, M. Mirrahimi, P. Rouchon, D. Esteve},
title = {Manipulating Fock states of a harmonic oscillator while preserving its linearity},
journal = {Physical Review A},
volume = {94},
number = {},
pages = {063861},
year = {2016},
}
= "r";var _rwObsfuscatedHref = _rwObsfuscatedHref0+_rwObsfuscatedHref1+_rwObsfuscatedHref2+_rwObsfuscatedHref3+_rwObsfuscatedHref4+_rwObsfuscatedHref5+_rwObsfuscatedHref6+_rwObsfuscatedHref7+_rwObsfuscatedHref8+_rwObsfuscatedHref9+_rwObsfuscatedHref10+_rwObsfuscatedHref11+_rwObsfuscatedHref12+_rwObsfuscatedHref13+_rwObsfuscatedHref14; document.getElementById("rw_email_contact").href = _rwObsfuscatedHref;