Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters
Realizing scalable quantum networks requires a meticulous level of understanding and mitigating the deleterious effects of decoherence. Many quantum device platforms feature multiple decoherence mechanisms, often with a dominant mechanism seemingly fully masking others. In this paper, we show how ac...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-03-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.5.013176 |
| _version_ | 1797210537029795840 |
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| author | J. Wiercinski E. M. Gauger M. Cygorek |
| author_facet | J. Wiercinski E. M. Gauger M. Cygorek |
| author_sort | J. Wiercinski |
| collection | DOAJ |
| description | Realizing scalable quantum networks requires a meticulous level of understanding and mitigating the deleterious effects of decoherence. Many quantum device platforms feature multiple decoherence mechanisms, often with a dominant mechanism seemingly fully masking others. In this paper, we show how access to weaker dephasing mechanisms can nevertheless be obtained for optically active qubits by performing two-photon coincidence measurements. To this end we theoretically investigate the impact of different decoherence mechanisms on cooperatively emitting quantum dots. Focusing on the typically dominant deformation-potential coupling to longitudinal acoustic phonons and typically much less severe additional sources of pure dephasing, we employ a numerically exact method to show that these mechanisms lead to very different two-photon coincidence signals. Moreover, surprisingly, the impact of the strongly coupled phonon environment is weak and leads to long-lived coherences. We trace this back to the superohmic nature of the deformation-potential coupling causing interemitter coherences to converge to a nonzero value on a short timescale, whereas pure dephasing contributions cause a complete decay of coherence over longer times. Our approach provides a practical means of investigating decoherence processes on different timescales in solid-state emitters, and thus contributes to understanding and possibly eliminating their detrimental influences. |
| first_indexed | 2024-04-24T10:12:10Z |
| format | Article |
| id | doaj.art-c06b71924a134baca9534f648a1bf209 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:12:10Z |
| publishDate | 2023-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-c06b71924a134baca9534f648a1bf2092024-04-12T17:29:13ZengAmerican Physical SocietyPhysical Review Research2643-15642023-03-015101317610.1103/PhysRevResearch.5.013176Phonon coupling versus pure dephasing in the photon statistics of cooperative emittersJ. WiercinskiE. M. GaugerM. CygorekRealizing scalable quantum networks requires a meticulous level of understanding and mitigating the deleterious effects of decoherence. Many quantum device platforms feature multiple decoherence mechanisms, often with a dominant mechanism seemingly fully masking others. In this paper, we show how access to weaker dephasing mechanisms can nevertheless be obtained for optically active qubits by performing two-photon coincidence measurements. To this end we theoretically investigate the impact of different decoherence mechanisms on cooperatively emitting quantum dots. Focusing on the typically dominant deformation-potential coupling to longitudinal acoustic phonons and typically much less severe additional sources of pure dephasing, we employ a numerically exact method to show that these mechanisms lead to very different two-photon coincidence signals. Moreover, surprisingly, the impact of the strongly coupled phonon environment is weak and leads to long-lived coherences. We trace this back to the superohmic nature of the deformation-potential coupling causing interemitter coherences to converge to a nonzero value on a short timescale, whereas pure dephasing contributions cause a complete decay of coherence over longer times. Our approach provides a practical means of investigating decoherence processes on different timescales in solid-state emitters, and thus contributes to understanding and possibly eliminating their detrimental influences.http://doi.org/10.1103/PhysRevResearch.5.013176 |
| spellingShingle | J. Wiercinski E. M. Gauger M. Cygorek Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters Physical Review Research |
| title | Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters |
| title_full | Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters |
| title_fullStr | Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters |
| title_full_unstemmed | Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters |
| title_short | Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters |
| title_sort | phonon coupling versus pure dephasing in the photon statistics of cooperative emitters |
| url | http://doi.org/10.1103/PhysRevResearch.5.013176 |
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