Experimental demonstration of a high-fidelity virtual two-qubit gate
We experimentally demonstrate a virtual two-qubit gate and characterize it using quantum process tomography (QPT). The virtual two-qubit gate decomposes an actual two-qubit gate into single-qubit unitary gates and projection gates in quantum circuits for expectation-value estimation. We implement pr...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2024-03-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.6.013235 |
| _version_ | 1797210251075780608 |
|---|---|
| author | Akhil Pratap Singh Kosuke Mitarai Yasunari Suzuki Kentaro Heya Yutaka Tabuchi Keisuke Fujii Yasunobu Nakamura |
| author_facet | Akhil Pratap Singh Kosuke Mitarai Yasunari Suzuki Kentaro Heya Yutaka Tabuchi Keisuke Fujii Yasunobu Nakamura |
| author_sort | Akhil Pratap Singh |
| collection | DOAJ |
| description | We experimentally demonstrate a virtual two-qubit gate and characterize it using quantum process tomography (QPT). The virtual two-qubit gate decomposes an actual two-qubit gate into single-qubit unitary gates and projection gates in quantum circuits for expectation-value estimation. We implement projection gates via midcircuit measurements. The deterministic sampling scheme reduces the number of experimental circuit evaluations required for decomposing a virtual two-qubit gate. We also apply quantum error mitigation to suppress the effect of measurement errors and improve the average gate fidelity of a virtual controlled-Z (CZ) gate to f_{av}=0.9938±0.0002. Our results highlight a practical approach to implement virtual two-qubit gates with high fidelities, which are useful for simulating quantum circuits using fewer qubits and implementing two-qubit gates on a distant pair of qubits. |
| first_indexed | 2024-04-24T10:07:37Z |
| format | Article |
| id | doaj.art-ac035c19e81f43c5bcb73b161c28013c |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:07:37Z |
| publishDate | 2024-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-ac035c19e81f43c5bcb73b161c28013c2024-04-12T17:39:58ZengAmerican Physical SocietyPhysical Review Research2643-15642024-03-016101323510.1103/PhysRevResearch.6.013235Experimental demonstration of a high-fidelity virtual two-qubit gateAkhil Pratap SinghKosuke MitaraiYasunari SuzukiKentaro HeyaYutaka TabuchiKeisuke FujiiYasunobu NakamuraWe experimentally demonstrate a virtual two-qubit gate and characterize it using quantum process tomography (QPT). The virtual two-qubit gate decomposes an actual two-qubit gate into single-qubit unitary gates and projection gates in quantum circuits for expectation-value estimation. We implement projection gates via midcircuit measurements. The deterministic sampling scheme reduces the number of experimental circuit evaluations required for decomposing a virtual two-qubit gate. We also apply quantum error mitigation to suppress the effect of measurement errors and improve the average gate fidelity of a virtual controlled-Z (CZ) gate to f_{av}=0.9938±0.0002. Our results highlight a practical approach to implement virtual two-qubit gates with high fidelities, which are useful for simulating quantum circuits using fewer qubits and implementing two-qubit gates on a distant pair of qubits.http://doi.org/10.1103/PhysRevResearch.6.013235 |
| spellingShingle | Akhil Pratap Singh Kosuke Mitarai Yasunari Suzuki Kentaro Heya Yutaka Tabuchi Keisuke Fujii Yasunobu Nakamura Experimental demonstration of a high-fidelity virtual two-qubit gate Physical Review Research |
| title | Experimental demonstration of a high-fidelity virtual two-qubit gate |
| title_full | Experimental demonstration of a high-fidelity virtual two-qubit gate |
| title_fullStr | Experimental demonstration of a high-fidelity virtual two-qubit gate |
| title_full_unstemmed | Experimental demonstration of a high-fidelity virtual two-qubit gate |
| title_short | Experimental demonstration of a high-fidelity virtual two-qubit gate |
| title_sort | experimental demonstration of a high fidelity virtual two qubit gate |
| url | http://doi.org/10.1103/PhysRevResearch.6.013235 |
| work_keys_str_mv | AT akhilpratapsingh experimentaldemonstrationofahighfidelityvirtualtwoqubitgate AT kosukemitarai experimentaldemonstrationofahighfidelityvirtualtwoqubitgate AT yasunarisuzuki experimentaldemonstrationofahighfidelityvirtualtwoqubitgate AT kentaroheya experimentaldemonstrationofahighfidelityvirtualtwoqubitgate AT yutakatabuchi experimentaldemonstrationofahighfidelityvirtualtwoqubitgate AT keisukefujii experimentaldemonstrationofahighfidelityvirtualtwoqubitgate AT yasunobunakamura experimentaldemonstrationofahighfidelityvirtualtwoqubitgate |