New Design of three-qubit system with three transmons and a single fixed-frequency resonator coupler
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909436015017984 |
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| author | Kang, Jeongsoo Kim, Chanpyo Kim, Younghun Kwon, Younghun |
| author_facet | Kang, Jeongsoo Kim, Chanpyo Kim, Younghun Kwon, Younghun |
| contents | The transmon, which has a short gate time and remarkable scalability, is the most commonly utilized superconducting qubit, based on the Cooper pair box as a qubit or coupler in superconducting quantum computers. Lattice and heavy-hexagon structures are well-known large-scale configurations for transmon-based quantum computers that classical computers cannot simulate. These structures share a common feature: a resonator coupler that connects two transmon qubits. Although significant progress has been made in implementing quantum error correction and quantum computing using quantum error mitigation, fault-tolerant quantum computing remains unachieved due to the inherent vulnerability of these structures. This raises the question of whether the transmon-resonator-transmon structure is the best option for constructing a transmon-based quantum computer. To address this, we demonstrate that the average fidelity of CNOT gates can exceed 0.98 in a structure where a resonator coupler mediates the coupling of three transmon qubits. This result suggests that our novel structure could be a key method for increasing the number of connections among qubits while preserving gate performance in a transmon-based quantum computer. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15629 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | New Design of three-qubit system with three transmons and a single fixed-frequency resonator coupler Kang, Jeongsoo Kim, Chanpyo Kim, Younghun Kwon, Younghun Quantum Physics The transmon, which has a short gate time and remarkable scalability, is the most commonly utilized superconducting qubit, based on the Cooper pair box as a qubit or coupler in superconducting quantum computers. Lattice and heavy-hexagon structures are well-known large-scale configurations for transmon-based quantum computers that classical computers cannot simulate. These structures share a common feature: a resonator coupler that connects two transmon qubits. Although significant progress has been made in implementing quantum error correction and quantum computing using quantum error mitigation, fault-tolerant quantum computing remains unachieved due to the inherent vulnerability of these structures. This raises the question of whether the transmon-resonator-transmon structure is the best option for constructing a transmon-based quantum computer. To address this, we demonstrate that the average fidelity of CNOT gates can exceed 0.98 in a structure where a resonator coupler mediates the coupling of three transmon qubits. This result suggests that our novel structure could be a key method for increasing the number of connections among qubits while preserving gate performance in a transmon-based quantum computer. |
| title | New Design of three-qubit system with three transmons and a single fixed-frequency resonator coupler |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2412.15629 |