Testing quantum computers with the protocol of quantum state matching
- URL: http://arxiv.org/abs/2210.09674v1
- Date: Tue, 18 Oct 2022 08:25:34 GMT
- Title: Testing quantum computers with the protocol of quantum state matching
- Authors: Adrian Ortega, Orsolya K\'alm\'an, Tam\'as Kiss
- Abstract summary: The presence of noise in quantum computers hinders their effective operation.
We suggest the application of the so-called quantum state matching protocol for testing purposes.
For systematically varied inputs we find that the device with the smaller quantum volume performs better on our tests than the one with larger quantum volume.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The presence of noise in quantum computers hinders their effective operation.
Even though quantum error correction can theoretically remedy this problem, its
practical realization is still a challenge. Testing and benchmarking noisy,
intermediate-scale quantum (NISC) computers is therefore of high importance.
Here, we suggest the application of the so-called quantum state matching
protocol for testing purposes. This protocol was originally proposed to
determine if an unknown quantum state falls in a prescribed neighborhood of a
reference state. We decompose the unitary specific to the protocol and
construct the quantum circuit implementing one step of the dynamics for
different characteristic parameters of the scheme and present test results for
two different IBM quantum computers. By comparing the experimentally obtained
relative frequencies of success to the ideal success probability with a maximum
statistical tolerance, we discriminate statistical errors from device specific
ones. For the characterization of noise, we also use the fact that while the
output of the ideal protocol is insensitive to the internal phase of the input
state, the actual implementation may lead to deviations. For systematically
varied inputs we find that the device with the smaller quantum volume performs
better on our tests than the one with larger quantum volume, while for random
inputs they show a more similar performance.
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