Efficient High-Dimensional Entangled State Analyzer with Linear Optics
The use of higher-dimensional photonic encodings (qudits) instead of two-dimensional encodings (qubits) can improve the loss tolerance and reduce the computational resources of photonic-based quantum information processing. To harness this potential, efficient schemes for entangling operations such...
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| Language: | English |
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Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2025-04-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2025-04-18-1711/pdf/ |
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| author | Niv Bharos Liubov Markovich Johannes Borregaard |
| author_facet | Niv Bharos Liubov Markovich Johannes Borregaard |
| author_sort | Niv Bharos |
| collection | DOAJ |
| description | The use of higher-dimensional photonic encodings (qudits) instead of two-dimensional encodings (qubits) can improve the loss tolerance and reduce the computational resources of photonic-based quantum information processing. To harness this potential, efficient schemes for entangling operations such as the high-dimensional generalization of a linear optics Bell measurement will be required. We show how an efficient high-dimensional entangled state analyzer can be implemented with a linear optics interferometer and auxiliary photonic states. The degree of entanglement of the auxiliary state is much less than in previous protocols as quantified by an exponentially smaller Schmidt rank. In addition, the auxiliary state only occupies a single spatial mode, allowing it to be generated deterministically from a single quantum emitter coupled to a small qubit register. The reduced complexity of the auxiliary states results in a high robustness to imperfections and we show that auxiliary states with fidelities above 0.9 for qudit dimensions 4 can be generated in the presence of qubit error rates on the order of 10%. This paves the way for experimental demonstrations with current hardware. |
| format | Article |
| id | doaj-art-e00ce5767e064f0e97e82992b3be7fda |
| institution | DOAJ |
| issn | 2521-327X |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften |
| record_format | Article |
| series | Quantum |
| spelling | doaj-art-e00ce5767e064f0e97e82992b3be7fda2025-08-20T03:18:09ZengVerein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenQuantum2521-327X2025-04-019171110.22331/q-2025-04-18-171110.22331/q-2025-04-18-1711Efficient High-Dimensional Entangled State Analyzer with Linear OpticsNiv BharosLiubov MarkovichJohannes BorregaardThe use of higher-dimensional photonic encodings (qudits) instead of two-dimensional encodings (qubits) can improve the loss tolerance and reduce the computational resources of photonic-based quantum information processing. To harness this potential, efficient schemes for entangling operations such as the high-dimensional generalization of a linear optics Bell measurement will be required. We show how an efficient high-dimensional entangled state analyzer can be implemented with a linear optics interferometer and auxiliary photonic states. The degree of entanglement of the auxiliary state is much less than in previous protocols as quantified by an exponentially smaller Schmidt rank. In addition, the auxiliary state only occupies a single spatial mode, allowing it to be generated deterministically from a single quantum emitter coupled to a small qubit register. The reduced complexity of the auxiliary states results in a high robustness to imperfections and we show that auxiliary states with fidelities above 0.9 for qudit dimensions 4 can be generated in the presence of qubit error rates on the order of 10%. This paves the way for experimental demonstrations with current hardware.https://quantum-journal.org/papers/q-2025-04-18-1711/pdf/ |
| spellingShingle | Niv Bharos Liubov Markovich Johannes Borregaard Efficient High-Dimensional Entangled State Analyzer with Linear Optics Quantum |
| title | Efficient High-Dimensional Entangled State Analyzer with Linear Optics |
| title_full | Efficient High-Dimensional Entangled State Analyzer with Linear Optics |
| title_fullStr | Efficient High-Dimensional Entangled State Analyzer with Linear Optics |
| title_full_unstemmed | Efficient High-Dimensional Entangled State Analyzer with Linear Optics |
| title_short | Efficient High-Dimensional Entangled State Analyzer with Linear Optics |
| title_sort | efficient high dimensional entangled state analyzer with linear optics |
| url | https://quantum-journal.org/papers/q-2025-04-18-1711/pdf/ |
| work_keys_str_mv | AT nivbharos efficienthighdimensionalentangledstateanalyzerwithlinearoptics AT liubovmarkovich efficienthighdimensionalentangledstateanalyzerwithlinearoptics AT johannesborregaard efficienthighdimensionalentangledstateanalyzerwithlinearoptics |