Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum circuit architecture search: error mitigation and trainability
  enhancement for variational quantum solvers   Quantum error mitigation techniques are at the heart of quantum hardware
implementation, and are the key to performance improvement of the variational
quantum learning scheme (VQLS). Although VQLS is partially robust to noise,
both empirical and theoretical results exhibit that noise would rapidly
deteriorate the performance of most variational quantum algorithms in
large-scale problems. Furthermore, VQLS suffers from the barren plateau
phenomenon---the gradient generated by the classical optimizer vanishes
exponentially with respect to the qubit number. Here we devise a resource and
runtime efficient scheme, the quantum architecture search scheme (QAS), to
maximally improve the robustness and trainability of VQLS. In particular, given
a learning task, QAS actively seeks an optimal circuit architecture to balance
benefits and side-effects brought by adding more quantum gates. Specifically,
while more quantum gates enable a stronger expressive power of the quantum
model, they introduce a larger amount of noise and a more serious barren
plateau scenario. Consequently, QAS can effectively suppress the influence of
quantum noise and barren plateaus. We implement QAS on both the numerical
simulator and real quantum hardware, via the IBM cloud, to accomplish data
classification and quantum chemistry tasks. Numerical and experimental results
show that QAS significantly outperforms conventional variational quantum
algorithms with heuristic circuit architectures. Our work provides practical
guidance for developing advanced learning-based quantum error mitigation
techniques on near-term quantum devices.

20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int