Quantum optics with quantum gases: controlled state reduction by designed light scattering
Cavity enhanced light scattering off an ultracold gas in an optical lattice constitutes a quantum measurement with a controllable form of the measurement back-action. Time-resolved counting of scattered photons alters the state of the atoms without particle loss implementing a quantum nondemolition...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2009
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| _version_ | 1826283642008109056 |
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| author | Mekhov, I Ritsch, H |
| author_facet | Mekhov, I Ritsch, H |
| author_sort | Mekhov, I |
| collection | OXFORD |
| description | Cavity enhanced light scattering off an ultracold gas in an optical lattice constitutes a quantum measurement with a controllable form of the measurement back-action. Time-resolved counting of scattered photons alters the state of the atoms without particle loss implementing a quantum nondemolition (QND) measurement. The conditional dynamics is given by the interplay between photodetection events (quantum jumps) and no-count processes. The class of emerging atomic many-body states can be chosen via the optical geometry and light frequencies. Light detection along the angle of a diffraction maximum (Bragg angle) creates an atom-number squeezed state, while light detection at diffraction minima leads to the macroscopic superposition states (Schroedinger cat states) of different atom numbers in the cavity mode. A measurement of the cavity transmission intensity can lead to atom-number squeezed or macroscopic superposition states depending on its outcome. We analyze the robustness of the superposition with respect to missed counts and find that a transmission measurement yields more robust and controllable superposition states than the ones obtained by scattering at a diffraction minimum. |
| first_indexed | 2024-03-07T01:01:57Z |
| format | Journal article |
| id | oxford-uuid:8a0799be-d5b1-4830-a564-39b55a8c99e8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:01:57Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:8a0799be-d5b1-4830-a564-39b55a8c99e82022-03-26T22:28:33ZQuantum optics with quantum gases: controlled state reduction by designed light scatteringJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8a0799be-d5b1-4830-a564-39b55a8c99e8EnglishSymplectic Elements at Oxford2009Mekhov, IRitsch, HCavity enhanced light scattering off an ultracold gas in an optical lattice constitutes a quantum measurement with a controllable form of the measurement back-action. Time-resolved counting of scattered photons alters the state of the atoms without particle loss implementing a quantum nondemolition (QND) measurement. The conditional dynamics is given by the interplay between photodetection events (quantum jumps) and no-count processes. The class of emerging atomic many-body states can be chosen via the optical geometry and light frequencies. Light detection along the angle of a diffraction maximum (Bragg angle) creates an atom-number squeezed state, while light detection at diffraction minima leads to the macroscopic superposition states (Schroedinger cat states) of different atom numbers in the cavity mode. A measurement of the cavity transmission intensity can lead to atom-number squeezed or macroscopic superposition states depending on its outcome. We analyze the robustness of the superposition with respect to missed counts and find that a transmission measurement yields more robust and controllable superposition states than the ones obtained by scattering at a diffraction minimum. |
| spellingShingle | Mekhov, I Ritsch, H Quantum optics with quantum gases: controlled state reduction by designed light scattering |
| title | Quantum optics with quantum gases: controlled state reduction by
designed light scattering |
| title_full | Quantum optics with quantum gases: controlled state reduction by
designed light scattering |
| title_fullStr | Quantum optics with quantum gases: controlled state reduction by
designed light scattering |
| title_full_unstemmed | Quantum optics with quantum gases: controlled state reduction by
designed light scattering |
| title_short | Quantum optics with quantum gases: controlled state reduction by
designed light scattering |
| title_sort | quantum optics with quantum gases controlled state reduction by designed light scattering |
| work_keys_str_mv | AT mekhovi quantumopticswithquantumgasescontrolledstatereductionbydesignedlightscattering AT ritschh quantumopticswithquantumgasescontrolledstatereductionbydesignedlightscattering |