1202.5387 (Shi-Biao Zheng)

Unconventional geometric quantum phase gates with a cavity QED system    [PDF]

Shi-Biao Zheng

We propose a scheme for realizing two-qubit quantum phase gates via an
unconventional geometric phase shift with atoms in a cavity. In the scheme the
atoms interact simultaneously with a highly detuned cavity mode and a classical
field. The atoms undergo no transitions during the gate operation, while the
cavity mode is displaced along a circle in the phase space, aquiring a
geometric phase conditional upon the atomic state. Under certain conditions,
the atoms are disentangled with the cavity mode and thus the gate is
insensitive to both the atomic spontaneous emission and the cavity decay.

View original: http://arxiv.org/abs/1202.5387