Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Zeno and anti-Zeno effects induced by either frequent
  measurements, modulations, or a mix of them   Using numerical calculations, we compare the collective transition
probabilities of many spins in random magnetic fields, subject to either
frequent projective measurements, frequent phase modulations, or a mix of
modulations and measurements. For three different distribution functions
(Gaussian, Lorentzian, and exponential) we consider here, the transition
probability under frequent modulations is suppressed most if the pulse delay is
short and the evolution time is larger than a critical value. Furthermore,
decoherence freezing (with a transition rate equals to zero) occurs when there
are frequent phase modulations, while the transition rate only decreases when
there are frequent measurements and a mix of them, as the pulse delay
approaches zero. In the large pulse-delay region, however, the transition
probabilities under frequent modulations are enhanced more than those under
either frequent measurements or a mix of modulations and measurements.

32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn