Quantum Inf Process (2013) 12:3057–3066
Generation of NOON states via Raman transitions
in a bimodal cavity
Kai Liu · Li-Bo Chen · Peng Shi ·
Wen-Zhao Zhang · Yong-Jian Gu
Received: 14 May 2012 / Accepted: 23 April 2013 / Published online: 9 May 2013
© Springer Science+Business Media New York 2013
Abstract We propose a scheme for generation of NOON states via Raman transitions.
In the scheme, a double Λ-type three-level atom is trapped in a high-Q bimodal cavity
which is initially in vacuum states. After a series of operations and suitable interaction
time, we can obtain highly nonclassical entangled states of one atom and N photons.
Then it can easily be converted to purely photonic NOON states by application of a
single projective measurement on the atom. The successful probability and ﬁdelity of
the scheme are ﬁnally discussed.
Keywords Entanglement · NOON state · Raman transition
Since nonlocal two-particle correlations have been discussed by Einstein, Podolsky,
and Rosen, quantum entanglement has long been recognised as a distinctive feature and
played a central role in quantum mechanics. Multi-particle entangled states are cen-
tral to quantum computing , quantum teleportation [2–5], and quantum metrology
[6–8]. Recently, much attention has been paid to an interesting and useful multi-particle
entangled state, the so-called NOON state in the form of
K. Liu · P. S hi · W.-Z. Zhang · Y. - J . G u (
Department of Physics, Ocean University of China, Qingdao 266100, People’s Republic of China
School of Science, Qingdao Technological University, Qingdao 266033, People’s Republic of China