Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A high-sensitivity gate-based charge sensor in silicon   The implementation of a quantum computer requires a qubit-specific
measurement capability to read-out the final state of a quantum system. The
model of spin dependent tunneling followed by charge readout has been highly
successful in enabling spin qubit experiments in all-electrical, semiconductor
based quantum computing. As experiments grow more sophisticated, and head
towards multiple qubit architectures that enable small scale computation, it
becomes important to consider the charge read-out overhead. With this in mind,
Reilly et al. demonstrated a gate readout scheme in a GaAs double quantum dot
that removed the need for an external charge sensor. This readout, which
achieved sensitivities of order me/$\sqrt(Hz)$, was enabled by using a resonant
circuit to probe the complex radio-frequency polarisability of the double
quantum dot. However, the ultimate performance of this technology and the noise
sources that limit it remain to be determined. Here, we investigate a
gate-based readout scheme using a radio-frequency resonant circuit strongly
coupled to a double quantum at the corner states of a silicon nanowire
transistor. We find a significantly improved charge sensitivity of 37
$\mu$e/$\sqrt(Hz)$. By solving the dynamical master equation of the fast-driven
electronic transitions we quantify the noise spectral density and determine the
ultimate charge and phase sensitivity of gate-based read-out. We find
comparable performance to conventional charge sensors and fundamental limits of
order ne/$\sqrt(Hz)$ and $\mu$rad/$\sqrt(Hz)$, with the gate-based sensor
improving on standard detection for certain device parameters. Our results show
that, especially in state-of-the-art silicon qubit architectures, charge
detection by probing the complex polarisability has advantages in terms of
reducing the readout overhead but also in terms of the absolute charge
sensitivity.

3
The categories of this paper are: physics
2
The categories of this paper are: math
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
16
The categories of this paper are: stat