Dissipative protection of a GKP qubit in a high-impedance superconducting circuit driven by a microwave frequency comb
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866908285237460992 |
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| author | Sellem, Lev-Arcady Sarlette, Alain Leghtas, Zaki Mirrahimi, Mazyar Rouchon, Pierre Campagne-Ibarcq, Philippe |
| author_facet | Sellem, Lev-Arcady Sarlette, Alain Leghtas, Zaki Mirrahimi, Mazyar Rouchon, Pierre Campagne-Ibarcq, Philippe |
| contents | We propose a novel approach to generate, protect and control GKP qubits. It employs a microwave frequency comb parametrically modulating a Josephson circuit to enforce a dissipative dynamics of a high impedance circuit mode, autonomously stabilizing the finite-energy GKP code. The encoded GKP qubit is robustly protected against all dominant decoherence channels plaguing superconducting circuits but quasi-particle poisoning. In particular, noise from ancillary modes leveraged for dissipation engineering does not propagate at the logical level. In a state-of-the-art experimental setup, we estimate that the encoded qubit lifetime could extend two orders of magnitude beyond the break-even point, with substantial margin for improvement through progress in fabrication and control electronics. Qubit initialization, readout and control via Clifford gates can be performed while maintaining the code stabilization, paving the way toward the assembly of GKP qubits in a fault-tolerant quantum computing architecture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_01425 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dissipative protection of a GKP qubit in a high-impedance superconducting circuit driven by a microwave frequency comb Sellem, Lev-Arcady Sarlette, Alain Leghtas, Zaki Mirrahimi, Mazyar Rouchon, Pierre Campagne-Ibarcq, Philippe Quantum Physics Optimization and Control We propose a novel approach to generate, protect and control GKP qubits. It employs a microwave frequency comb parametrically modulating a Josephson circuit to enforce a dissipative dynamics of a high impedance circuit mode, autonomously stabilizing the finite-energy GKP code. The encoded GKP qubit is robustly protected against all dominant decoherence channels plaguing superconducting circuits but quasi-particle poisoning. In particular, noise from ancillary modes leveraged for dissipation engineering does not propagate at the logical level. In a state-of-the-art experimental setup, we estimate that the encoded qubit lifetime could extend two orders of magnitude beyond the break-even point, with substantial margin for improvement through progress in fabrication and control electronics. Qubit initialization, readout and control via Clifford gates can be performed while maintaining the code stabilization, paving the way toward the assembly of GKP qubits in a fault-tolerant quantum computing architecture. |
| title | Dissipative protection of a GKP qubit in a high-impedance superconducting circuit driven by a microwave frequency comb |
| topic | Quantum Physics Optimization and Control |
| url | https://arxiv.org/abs/2304.01425 |