  Using the IRAM interferometer we have detected J=4-3 and 5-4 CO line emission
toward the radio quiet quasar PSS2322+1944. At a redshift of z_CO=4.1199 this
is the fourth and strongest detection of CO at z>4. The velocity-integrated CO
J=4-3 and J=5-4 line fluxes are 4.21+-0.40 and 3.74+-0.56 Jy km/s, and the
linewidth is ~300 km/s. The CO J=10-9 line was searched for but not detected
with an upper intensity limit of 30 mJy. The 1.35 mm (250 mum rest wavelength)
continuum flux density is 7.5+-1.3 mJy, in agreement with previous bolometer
measurements at 1.2 mm with the 30-m IRAM telescope. The 3mm (580 mum rest
wavelength) continuum is not detected with a 3 sigma upper limit of 0.7mJy. We
also report observations of the 450 mum continuum in PSS2322+1944 using the
SCUBA array at the JCMT. The quasar was detected with a 450 mum flux density of
79+-19mJy. At the angular resolution of 4.8" x 2.1" at 1.3mm and 6.2" x 4.9" at
3.2 mm, the interferometer observations do not show evidence of spatial
extension in the continuum or CO line emission. Assuming no gravitational
magnification, we estimate a molecular gas mass of ~2.5x10^11 M_sun. The
molecular gas is warm (40-100 K) and dense (10^3.5-10^4.1 cm^-3). The
infrared-to-CO luminosity ratio is ~185 L_sun/(K km/s pc^2), comparable to the
values found for ultraluminous infrared galaxies. The detection of CO emission
in this high redshift QSO provides further evidence that the radio emission and
the millimeter to submillimeter continuum emission are predominantly powered by
a starburst which is coeval with the AGN activity.
