Almost device-independent calibration beyond Born's rule: Bell tests for cross-talk detection
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915399724957696 |
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| author | Tabia, Gelo Noel M. Shih, Alex Yueh-Ting Zheng, Jin-Yuan Liang, Yeong-Cherng |
| author_facet | Tabia, Gelo Noel M. Shih, Alex Yueh-Ting Zheng, Jin-Yuan Liang, Yeong-Cherng |
| contents | In quantum information, device-independent protocols offer a new approach to information processing tasks, making minimal assumptions about the devices used. Typically, since these protocols draw conclusions directly from the data collected in a meaningful Bell test, the no-signaling conditions, and often even Born's rule for local measurements, are taken as premises of the protocol. Here, we demonstrate how to test such premises in an (almost) device-independent setting, i.e., directly from the raw data and with minimal assumptions. In particular, for IBM's quantum computing cloud services, we implement the prediction-based ratio protocol to characterize how well the qubits can be accessed locally and independently. More precisely, by performing a variety of Clauser-Horne-Shimony-Holt-type experiments on these systems and carrying out rigorous hypothesis tests on the collected data, we provide compelling evidence showing that some of these qubits suffer from cross-talks, i.e., their measurement statistics are affected by the choice of measurement bases on another qubit. Unlike standard randomized benchmarking, our approach does not rely on assumptions such as gate-independent Markovian noise. Moreover, despite the relatively small number of experimental trials, the direction of "signaling" may also be identified in some cases. Our approach thus serves as a complementary tool for benchmarking the local addressability of quantum computing devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18949 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Almost device-independent calibration beyond Born's rule: Bell tests for cross-talk detection Tabia, Gelo Noel M. Shih, Alex Yueh-Ting Zheng, Jin-Yuan Liang, Yeong-Cherng Quantum Physics In quantum information, device-independent protocols offer a new approach to information processing tasks, making minimal assumptions about the devices used. Typically, since these protocols draw conclusions directly from the data collected in a meaningful Bell test, the no-signaling conditions, and often even Born's rule for local measurements, are taken as premises of the protocol. Here, we demonstrate how to test such premises in an (almost) device-independent setting, i.e., directly from the raw data and with minimal assumptions. In particular, for IBM's quantum computing cloud services, we implement the prediction-based ratio protocol to characterize how well the qubits can be accessed locally and independently. More precisely, by performing a variety of Clauser-Horne-Shimony-Holt-type experiments on these systems and carrying out rigorous hypothesis tests on the collected data, we provide compelling evidence showing that some of these qubits suffer from cross-talks, i.e., their measurement statistics are affected by the choice of measurement bases on another qubit. Unlike standard randomized benchmarking, our approach does not rely on assumptions such as gate-independent Markovian noise. Moreover, despite the relatively small number of experimental trials, the direction of "signaling" may also be identified in some cases. Our approach thus serves as a complementary tool for benchmarking the local addressability of quantum computing devices. |
| title | Almost device-independent calibration beyond Born's rule: Bell tests for cross-talk detection |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.18949 |