Deterministic Bell state measurement with a single quantum memory
Abstract Entanglements serve as a resource for any quantum information system and are deterministically generated or swapped by a joint measurement called complete Bell state measurement (BSM). The determinism arises from a quantum nondemolition measurement of two coupled qubits with the help of rea...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-10-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-023-00771-z |
| _version_ | 1797557460550025216 |
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| author | Akira Kamimaki Keidai Wakamatsu Kosuke Mikata Yuhei Sekiguchi Hideo Kosaka |
| author_facet | Akira Kamimaki Keidai Wakamatsu Kosuke Mikata Yuhei Sekiguchi Hideo Kosaka |
| author_sort | Akira Kamimaki |
| collection | DOAJ |
| description | Abstract Entanglements serve as a resource for any quantum information system and are deterministically generated or swapped by a joint measurement called complete Bell state measurement (BSM). The determinism arises from a quantum nondemolition measurement of two coupled qubits with the help of readout ancilla, which inevitably requires extra physical qubits. We here demonstrate a deterministic and complete BSM with only a nitrogen atom in a nitrogen-vacancy (NV) center in diamond as a quantum memory without relying on any carbon isotopes, which are the extra qubits, by exploiting electron‒nitrogen (14N) double qutrits at a zero magnetic field. The degenerate logical qubits within the subspace of qutrits on the electron and nitrogen spins are holonomically controlled by arbitrarily polarized microwave and radiofrequency pulses via zero-field-split states as the ancilla, thus enabling the complete BSM deterministically. Since the system works under an isotope-free and field-free environment, the demonstration paves the way to realize high-fidelity quantum repeaters for long-haul quantum networks and quantum interfaces for large-scale distributed quantum computers. |
| first_indexed | 2024-03-10T17:17:22Z |
| format | Article |
| id | doaj.art-9983a148e3814a4f98b4bc7299bda185 |
| institution | Directory Open Access Journal |
| issn | 2056-6387 |
| language | English |
| last_indexed | 2024-03-10T17:17:22Z |
| publishDate | 2023-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj.art-9983a148e3814a4f98b4bc7299bda1852023-11-20T10:28:14ZengNature Portfolionpj Quantum Information2056-63872023-10-01911710.1038/s41534-023-00771-zDeterministic Bell state measurement with a single quantum memoryAkira Kamimaki0Keidai Wakamatsu1Kosuke Mikata2Yuhei Sekiguchi3Hideo Kosaka4Institute for Advanced Sciences (IAS), Yokohama National UniversityDepartment of Physics, Graduate School of Engineering Science, Yokohama National UniversityDepartment of Physics, Graduate School of Engineering Science, Yokohama National UniversityInstitute for Advanced Sciences (IAS), Yokohama National UniversityInstitute for Advanced Sciences (IAS), Yokohama National UniversityAbstract Entanglements serve as a resource for any quantum information system and are deterministically generated or swapped by a joint measurement called complete Bell state measurement (BSM). The determinism arises from a quantum nondemolition measurement of two coupled qubits with the help of readout ancilla, which inevitably requires extra physical qubits. We here demonstrate a deterministic and complete BSM with only a nitrogen atom in a nitrogen-vacancy (NV) center in diamond as a quantum memory without relying on any carbon isotopes, which are the extra qubits, by exploiting electron‒nitrogen (14N) double qutrits at a zero magnetic field. The degenerate logical qubits within the subspace of qutrits on the electron and nitrogen spins are holonomically controlled by arbitrarily polarized microwave and radiofrequency pulses via zero-field-split states as the ancilla, thus enabling the complete BSM deterministically. Since the system works under an isotope-free and field-free environment, the demonstration paves the way to realize high-fidelity quantum repeaters for long-haul quantum networks and quantum interfaces for large-scale distributed quantum computers.https://doi.org/10.1038/s41534-023-00771-z |
| spellingShingle | Akira Kamimaki Keidai Wakamatsu Kosuke Mikata Yuhei Sekiguchi Hideo Kosaka Deterministic Bell state measurement with a single quantum memory npj Quantum Information |
| title | Deterministic Bell state measurement with a single quantum memory |
| title_full | Deterministic Bell state measurement with a single quantum memory |
| title_fullStr | Deterministic Bell state measurement with a single quantum memory |
| title_full_unstemmed | Deterministic Bell state measurement with a single quantum memory |
| title_short | Deterministic Bell state measurement with a single quantum memory |
| title_sort | deterministic bell state measurement with a single quantum memory |
| url | https://doi.org/10.1038/s41534-023-00771-z |
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