Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improving coherence with nested environments   We have in mind a register of qubits for an quantum information system, and
consider its decoherence in an idealized but typical situation. Spontaneous
decay and other couplings to the far environment considered as the world
outside the quantum apparatus will be neglected, while couplings to quantum
states within the apparatus, i.e. to a near environment are assumed to
dominate. Thus the central system couples to the near environment which in turn
couples to a far environment. Considering that the dynamics in the near
environment is not sufficiently well known or controllable, we shall use random
matrix methods to obtain analytic results. We consider a simplified situation
where the central system suffers weak dephasing from the near environment,
which in turn is coupled randomly to the far environment. We find the
anti-intuitive result that increasing the coupling between near and far
environment actually protects the central qubit.

31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin