23 research outputs found
Bose-Einstein condensate in gases of rare atomic species
We report on the successful extension of production of Bose-Einstein
Condensate (BEC) to rare species. Despite its low natural abundance of 0.13%,
Yb is directly evaporatively cooled down to BEC. Our successful
demonstration encourages attempts to obtain quantum gases of radioactive atoms,
which extends the possibility of quantum many-body physics and precision
measurement. Moreover, a stable binary mixture of Yb BEC and Yb
BEC is successfully formed.Comment: 5 pages, 3 figures. Accepted for Phys. Rev.
Realization of SU(2)*SU(6) Fermi System
We report the realization of a novel degenerate Fermi mixture with an
SU(2)*SU(6) symmetry in a cold atomic gas. We successfully cool the mixture of
the two fermionic isotopes of ytterbium 171Yb with the nuclear spin I=1/2 and
173Yb with I=5/2 below the Fermi temperature T_ F as 0.46T_F for 171Yb and
0.54T_F for 173Yb. The same scattering lengths for different spin components
make this mixture featured with the novel SU(2)*SU(6) symmetry. The nuclear
spin components are separately imaged by exploiting an optical Stern-Gerlach
effect. In addition, the mixture is loaded into a 3D optical lattice to
implement the SU(2)*SU(6) Hubbard model. This mixture will open the door to the
study of novel quantum phases such as a spinor Bardeen-Cooper-Schrieffer-like
fermionic superfluid.Comment: 4 pages, 5 figures V2: revised reference
Quantum magnonics: magnon meets superconducting qubit
The techniques of microwave quantum optics are applied to collective spin
excitations in a macroscopic sphere of ferromagnetic insulator. We demonstrate,
in the single-magnon limit, strong coupling between a magnetostatic mode in the
sphere and a microwave cavity mode. Moreover, we introduce a superconducting
qubit in the cavity and couple the qubit with the magnon excitation via the
virtual photon excitation. We observe the magnon-vacuum-induced Rabi splitting.
The hybrid quantum system enables generation and characterization of
non-classical quantum states of magnons.Comment: 10 pages, 6 figure