Modular Superconducting Qubit Architecture with a Multi-chip Tunable Coupler
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911895019061248 |
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| author | Field, Mark Chen, Angela Q. Scharmann, Ben Sete, Eyob A. Oruc, Feyza Vu, Kim Kosenko, Valentin Mutus, Joshua Y. Poletto, Stefano Bestwick, Andrew |
| author_facet | Field, Mark Chen, Angela Q. Scharmann, Ben Sete, Eyob A. Oruc, Feyza Vu, Kim Kosenko, Valentin Mutus, Joshua Y. Poletto, Stefano Bestwick, Andrew |
| contents | We use a floating tunable coupler to mediate interactions between qubits on separate chips to build a modular architecture. We demonstrate three different designs of multi-chip tunable couplers using vacuum gap capacitors or superconducting indium bump bonds to connect the coupler to a microwave line on a common substrate and then connect to the qubit on the next chip. We show that the zero-coupling condition between qubits on separate chips can be achieved in each design and that the relaxation rates for the coupler and qubits are not noticeably affected by the extra circuit elements. Finally, we demonstrate two-qubit gate operations with fidelity at the same level as qubits with a tunable coupler on a single chip. Using one or more indium bonds does not degrade qubit coherence or impact the performance of two-qubit gates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_09240 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Modular Superconducting Qubit Architecture with a Multi-chip Tunable Coupler Field, Mark Chen, Angela Q. Scharmann, Ben Sete, Eyob A. Oruc, Feyza Vu, Kim Kosenko, Valentin Mutus, Joshua Y. Poletto, Stefano Bestwick, Andrew Quantum Physics Applied Physics We use a floating tunable coupler to mediate interactions between qubits on separate chips to build a modular architecture. We demonstrate three different designs of multi-chip tunable couplers using vacuum gap capacitors or superconducting indium bump bonds to connect the coupler to a microwave line on a common substrate and then connect to the qubit on the next chip. We show that the zero-coupling condition between qubits on separate chips can be achieved in each design and that the relaxation rates for the coupler and qubits are not noticeably affected by the extra circuit elements. Finally, we demonstrate two-qubit gate operations with fidelity at the same level as qubits with a tunable coupler on a single chip. Using one or more indium bonds does not degrade qubit coherence or impact the performance of two-qubit gates. |
| title | Modular Superconducting Qubit Architecture with a Multi-chip Tunable Coupler |
| topic | Quantum Physics Applied Physics |
| url | https://arxiv.org/abs/2308.09240 |