648 Hilbert space dimensionality in a biphoton frequency comb
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
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2020
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| _version_ | 1866916613152833536 |
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| author | Chang, K. -C. Cheng, X. Sarihan, M. C. Kumar, A. Lee, Y. S. Zhong, T. Gong, Y. -X. Xie, Z. Shapiro, J. H. Wong, F. N. C. Wong, C. W. |
| author_facet | Chang, K. -C. Cheng, X. Sarihan, M. C. Kumar, A. Lee, Y. S. Zhong, T. Gong, Y. -X. Xie, Z. Shapiro, J. H. Wong, F. N. C. Wong, C. W. |
| contents | Qubit entanglement is a valuable resource for quantum information processing, where increasing its dimensionality provides a pathway towards higher capacity and increased error resilience in quantum communications, cluster computation and quantum phase measurements. Time-frequency entanglement, a continuous variable subspace, enables the high-dimensional encoding of multiple qubits per particle, bounded only by the spectral correlation bandwidth and readout timing jitter. Extending from a dimensionality of two in discrete polarization variables, here we demonstrate a hyperentangled, mode-locked, biphoton frequency comb with a time-frequency Hilbert space dimensionality of at least 648. Hong-Ou-Mandel revivals of the biphoton qubits are observed with 61 time-bin recurrences, biphoton joint spectral correlations over 19 frequency-bins, and an overall interference visibility of the high-dimensional qubits up to 98.4%. We describe the Schmidt mode decomposition analysis of the high-dimensional entanglement, in both time- and frequency-bin subspaces, not only verifying the entanglement dimensionality but also examining the time-frequency scaling. We observe a Bell violation of the high-dimensional qubits up to 18.5 standard deviations, with recurrent correlation-fringe Clauser-Horne-Shimony-Holt S-parameter up to 2.771. Our biphoton frequency comb serves as a platform for dense quantum information processing and high-dimensional quantum key distribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2005_07759 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | 648 Hilbert space dimensionality in a biphoton frequency comb Chang, K. -C. Cheng, X. Sarihan, M. C. Kumar, A. Lee, Y. S. Zhong, T. Gong, Y. -X. Xie, Z. Shapiro, J. H. Wong, F. N. C. Wong, C. W. Quantum Physics Qubit entanglement is a valuable resource for quantum information processing, where increasing its dimensionality provides a pathway towards higher capacity and increased error resilience in quantum communications, cluster computation and quantum phase measurements. Time-frequency entanglement, a continuous variable subspace, enables the high-dimensional encoding of multiple qubits per particle, bounded only by the spectral correlation bandwidth and readout timing jitter. Extending from a dimensionality of two in discrete polarization variables, here we demonstrate a hyperentangled, mode-locked, biphoton frequency comb with a time-frequency Hilbert space dimensionality of at least 648. Hong-Ou-Mandel revivals of the biphoton qubits are observed with 61 time-bin recurrences, biphoton joint spectral correlations over 19 frequency-bins, and an overall interference visibility of the high-dimensional qubits up to 98.4%. We describe the Schmidt mode decomposition analysis of the high-dimensional entanglement, in both time- and frequency-bin subspaces, not only verifying the entanglement dimensionality but also examining the time-frequency scaling. We observe a Bell violation of the high-dimensional qubits up to 18.5 standard deviations, with recurrent correlation-fringe Clauser-Horne-Shimony-Holt S-parameter up to 2.771. Our biphoton frequency comb serves as a platform for dense quantum information processing and high-dimensional quantum key distribution. |
| title | 648 Hilbert space dimensionality in a biphoton frequency comb |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2005.07759 |