DC-powered broadband quantum-limited microwave amplifier
Fuente:
arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866913092675305472 |
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| author | Nehra, N. Bourlet, N. Esmaeili, A. H. Monge, B. Cyrenne-Bergeron, F. Paquette, A. Arabmohammadi, M. Rogalle, A. Lapointe, Y. Hofheinz, M. |
| author_facet | Nehra, N. Bourlet, N. Esmaeili, A. H. Monge, B. Cyrenne-Bergeron, F. Paquette, A. Arabmohammadi, M. Rogalle, A. Lapointe, Y. Hofheinz, M. |
| contents | Fast, high-fidelity, single-shot readout of superconducting qubits in quantum processors demands quantum-limited amplifiers to preserve the optimal signal-to-noise ratio. Typically, quantum-limited amplification is achieved with parametric down-conversion of a strong pump tone, which imposes significant hardware overhead and severely limits scalability. Here, we demonstrate the first DC-powered broadband amplifier operating within 0.2 photons of the quantum limit. Our impedance-engineered Inelastic Cooper-pair Tunneling Amplifier (ICTA)-a voltage-biased SQUID in which Cooper pairs tunnel inelastically by emitting signal-idler photon pairs-operates in reflection, delivering 13 dB of average gain across a 3.5 GHz bandwidth in a single stage. Semiclassical simulations accurately predict the gain and saturation power, enabling further design improvements. By eliminating the pump-tone infrastructure, the broadband ICTA promises to dramatically reduce the hardware complexity of quantum-limited amplification in superconducting quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_19902 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | DC-powered broadband quantum-limited microwave amplifier Nehra, N. Bourlet, N. Esmaeili, A. H. Monge, B. Cyrenne-Bergeron, F. Paquette, A. Arabmohammadi, M. Rogalle, A. Lapointe, Y. Hofheinz, M. Quantum Physics Mesoscale and Nanoscale Physics Fast, high-fidelity, single-shot readout of superconducting qubits in quantum processors demands quantum-limited amplifiers to preserve the optimal signal-to-noise ratio. Typically, quantum-limited amplification is achieved with parametric down-conversion of a strong pump tone, which imposes significant hardware overhead and severely limits scalability. Here, we demonstrate the first DC-powered broadband amplifier operating within 0.2 photons of the quantum limit. Our impedance-engineered Inelastic Cooper-pair Tunneling Amplifier (ICTA)-a voltage-biased SQUID in which Cooper pairs tunnel inelastically by emitting signal-idler photon pairs-operates in reflection, delivering 13 dB of average gain across a 3.5 GHz bandwidth in a single stage. Semiclassical simulations accurately predict the gain and saturation power, enabling further design improvements. By eliminating the pump-tone infrastructure, the broadband ICTA promises to dramatically reduce the hardware complexity of quantum-limited amplification in superconducting quantum processors. |
| title | DC-powered broadband quantum-limited microwave amplifier |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2512.19902 |