Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Continuous monitoring measured signals bounded by past and future
  conditions in enlarged quantum systems   In a quantum system that is bounded by past and future conditions, weak
continuous monitoring forward-evolving and backward-evolving quantum states are
usually carried out separately. Therefore, measured signals at a given time t
cannot be monitored continuously. Here, we propose an enlarged-quantum-system
method to combine these two processes together. Therein, we introduce an
enlarged quantum state that contains both the forward- and backward-evolving
quantum states. The enlarged state is governed by an enlarged master equation
and propagates one-way forward in time. As a result, the measured signals at
time t can be monitored continuously and can provide advantages in the signals
amplification and signal processing techniques. Our proposal can be implemented
on various physical systems, such as superconducting circuits, NMR systems,
ion-traps, quantum photonics, and among others.

6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs