Superconducting antiqubits achieve optimal phase estimation via unitary inversion
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866913876938850304 |
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| author | Song, Xingrui Borjigin, Surihan Sean Salvati, Flavio Wang, Yu-Xin Halpern, Nicole Yunger Arvidsson-Shukur, David R. M. Murch, Kater |
| author_facet | Song, Xingrui Borjigin, Surihan Sean Salvati, Flavio Wang, Yu-Xin Halpern, Nicole Yunger Arvidsson-Shukur, David R. M. Murch, Kater |
| contents | A positron is equivalent to an electron traveling backward through time. Casting transmon superconducting qubits as akin to electrons, we simulate a positron with a transmon subject to particular resonant and off-resonant drives. We call positron-like transmons "antiqubits." An antiqubit's effective gyromagnetic ratio equals the negative of a qubit's. This fact enables us to time-invert a unitary implemented on a transmon by its environment. We apply this platform-specific unitary inversion, with qubit--antiqubit entanglement, to achieve a quantum advantage in phase estimation: consider measuring the strength of a field that points in an unknown direction. An entangled qubit--antiqubit sensor offers the greatest possible sensitivity (amount of Fisher information), per qubit, per application of the field. We prove this result theoretically and observe it experimentally. This work shows how antimatter, whether real or simulated, can enable platform-specific unitary inversion and benefit quantum information processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04315 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconducting antiqubits achieve optimal phase estimation via unitary inversion Song, Xingrui Borjigin, Surihan Sean Salvati, Flavio Wang, Yu-Xin Halpern, Nicole Yunger Arvidsson-Shukur, David R. M. Murch, Kater Quantum Physics Mesoscale and Nanoscale Physics High Energy Physics - Experiment Atomic Physics A positron is equivalent to an electron traveling backward through time. Casting transmon superconducting qubits as akin to electrons, we simulate a positron with a transmon subject to particular resonant and off-resonant drives. We call positron-like transmons "antiqubits." An antiqubit's effective gyromagnetic ratio equals the negative of a qubit's. This fact enables us to time-invert a unitary implemented on a transmon by its environment. We apply this platform-specific unitary inversion, with qubit--antiqubit entanglement, to achieve a quantum advantage in phase estimation: consider measuring the strength of a field that points in an unknown direction. An entangled qubit--antiqubit sensor offers the greatest possible sensitivity (amount of Fisher information), per qubit, per application of the field. We prove this result theoretically and observe it experimentally. This work shows how antimatter, whether real or simulated, can enable platform-specific unitary inversion and benefit quantum information processing. |
| title | Superconducting antiqubits achieve optimal phase estimation via unitary inversion |
| topic | Quantum Physics Mesoscale and Nanoscale Physics High Energy Physics - Experiment Atomic Physics |
| url | https://arxiv.org/abs/2506.04315 |