Proposal for Superconducting Quantum Networks Using Multi-Octave Transduction to Lower Frequencies
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916339657998336 |
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| author | Makihara, Takuma Jiang, Wentao Safavi-Naeini, Amir H. |
| author_facet | Makihara, Takuma Jiang, Wentao Safavi-Naeini, Amir H. |
| contents | We propose networking superconducting quantum circuits by transducing their excitations (typically 4-8 GHz) to 100-500 MHz photons for transmission via cryogenic coaxial cables. Counter-intuitively, this frequency downconversion reduces noise and transmission losses. We introduce a multi-octave asymmetrically threaded SQUID circuit (MOATS) capable of the required efficient, high-rate transduction. For a 100-meter cable with $Q_i = 10^5$ at 10 mK, our approach achieves single-photon fidelities of 0.962 at 200 MHz versus 0.772 at 8 GHz, and triples the lower bound on quantum channel capacity. This method enables kilometer-scale quantum links while maintaining high fidelities, combining improved performance with the practical advantages of flexible, compact coaxial cables. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20943 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Proposal for Superconducting Quantum Networks Using Multi-Octave Transduction to Lower Frequencies Makihara, Takuma Jiang, Wentao Safavi-Naeini, Amir H. Quantum Physics We propose networking superconducting quantum circuits by transducing their excitations (typically 4-8 GHz) to 100-500 MHz photons for transmission via cryogenic coaxial cables. Counter-intuitively, this frequency downconversion reduces noise and transmission losses. We introduce a multi-octave asymmetrically threaded SQUID circuit (MOATS) capable of the required efficient, high-rate transduction. For a 100-meter cable with $Q_i = 10^5$ at 10 mK, our approach achieves single-photon fidelities of 0.962 at 200 MHz versus 0.772 at 8 GHz, and triples the lower bound on quantum channel capacity. This method enables kilometer-scale quantum links while maintaining high fidelities, combining improved performance with the practical advantages of flexible, compact coaxial cables. |
| title | Proposal for Superconducting Quantum Networks Using Multi-Octave Transduction to Lower Frequencies |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2407.20943 |