SIMULTANEOUS SIDEBAND AND DOPPLER LASER COOLING

20250093740

18/887773

September 17, 2024

An atomic object confined in a particular region of a confinement apparatus is cooled via a simultaneous sideband and Doppler laser cooling operation. A controller controls first and second manipulation sources to provide first and second two-photon transition manipulation signals to the particular region. The controller controls a third manipulation source to provide a repump manipulation signal to the particular region. The first and second two-photon transition manipulation signals are collectively configured to cause the atomic object to undergo a red sideband transition from a first ground state to a second ground state. The repump manipulation signal is configured to repump the atomic object from the second ground state to the first ground state via an excited state. The repump manipulation signal is red detuned from a transition from the second ground state to the excited state by a repump detuning configured to cause Doppler cooling of the atomic object.

1. A method for cooling an atomic object confined by a confinement apparatus, the method comprising: controlling, by a controller associated with the confinement apparatus, a first manipulation source to provide a first two-photon transition manipulation signal to a particular region of the confinement apparatus; controlling, by the controller, a second manipulation source to provide a second two-photon transition manipulation signal to the particular region of the confinement apparatus; and controlling, by the controller, a third manipulation source to provide at least one repump manipulation signal to the particular region of the confinement apparatus; wherein: the atomic object to be cooled is located in the particular region of the confinement apparatus, the first two-photon transition manipulation signal and the second two-photon transition manipulation signal are collectively configured to drive a Raman transition that causes the atomic object to undergo a red sideband transition from a first ground state to a second ground state of the atomic object, the at least one repump manipulation signal is configured to repump the atomic object from the second ground state to the first ground state via at least one excited state, the at least one repump manipulation signal is red detuned from a transition from the second ground state to the at least one excited state by a repump detuning, and the repump detuning is in a range of 0.2 to 10 times a linewidth of the at least one excited state.

2. The method of claim 1, wherein at least one of the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, or the at least one repump manipulation signal are provided as sheet beams.

3. The method of claim 2, wherein the atomic object is one of a plurality of atomic objects confined by the confinement apparatus and the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, and the at least one repump manipulation signal are collectively configured to cool the plurality of atomic objects simultaneously.

4. The method of claim 1, wherein a single photon detuning is a detuning between the first two-photon transition manipulation signal and the at least one excited state and the single photon detuning is in a range of 0.5 to 500 times the linewidth of the at least one excited state.

5. The method of claim 1, wherein respective intensities of the first two-photon manipulation signal, the second two-photon manipulation signal, the at least one repump manipulation signal, and the repump detuning are configured to enable multiple motional modes of the atomic object to be cooled simultaneously.

6. The method of claim 1, wherein collectively the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, and the at least one repump manipulation signal cool the atomic object via continuous sideband cooling and Doppler cooling.

7. The method of claim 1, wherein a single photon detuning is a detuning between the first two-photon transition manipulation signal and the at least one excited state and the single photon detuning is in a range of 500 to 100,000 times the linewidth of the at least one excited state and the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, and the at least one repump manipulation signal are provided as focused laser beams.

8. The method of claim 1, wherein the first two-photon transition manipulation signal and the second two-photon transition manipulation signal are not co-propagating.

9. The method of claim 1, wherein the atomic object is part of an object crystal comprising the atomic object and a qubit object and the atomic object is configured to sympathetically cool the qubit object.

10. The method of claim 1, wherein a single photon detuning is a detuning between the first two-photon transition manipulation signal and the at least one excited state, for a first time period, the single photon detuning is in a range of 0.5 to 100 times the linewidth of the at least one excited state, and for a second time period, the single photon detuning is in a range of 500 to 100,000 times the linewidth of the at least one excited state.

11. A method for cooling an atomic object confined by a confinement apparatus, the method comprising: controlling, by a controller associated with the confinement apparatus, a first manipulation source to provide a first two-photon transition manipulation signal to a particular region of the confinement apparatus; controlling, by the controller, a second manipulation source to provide a second two-photon transition manipulation signal to the particular region of the confinement apparatus; and controlling, by the controller, a third manipulation source to provide at least one repump manipulation signal to the particular region of the confinement apparatus; wherein: the atomic object to be cooled is located in the particular region of the confinement apparatus, the first two-photon transition manipulation signal and the second two-photon transition manipulation signal are collectively configured to cause the atomic object to undergo a red sideband transition from a first ground state to a second ground state of the atomic object, the at least one repump manipulation signal is configured to repump the atomic object from the second ground state to the first ground state via at least one excited state, a single photon detuning is a detuning between the first two-photon transition manipulation signal and the at least one excited state, and the single photon detuning is in a range of 0.5 to 100 times a linewidth of the at least one excited state.

12. The method of claim 11, wherein the at least one repump manipulation signal is red detuned from a transition from the second ground state to the at least one excited state by a repump detuning, and the repump detuning is in a range of 0.2 to 10 times a linewidth of the at least one excited state.

13. The method of claim 11, wherein at least one of the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, or the at least one repump manipulation signal are provided as sheet beams.

14. The method of claim 13, wherein the atomic object is one of a plurality of atomic objects confined by the confinement apparatus, the particular region is one of a plurality of regions defined at least in part by the confinement apparatus, the plurality of atomic objects are confined at one or more of the plurality of regions of the confinement apparatus, and the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, and the at least one repump manipulation signal are collectively configured to cool the plurality of atomic objects simultaneously.

15. The method of claim 11, wherein respective intensities of the first two-photon manipulation signal, the second two-photon manipulation signal, the at least one repump manipulation signal, and the repump detuning are configured to enable multiple motional modes of the atomic object to be cooled simultaneously.

16. The method of claim 11, wherein collectively the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, and the at least one repump manipulation signal are configured to cool the atomic object via continuous sideband cooling and Doppler cooling simultaneously.

17. The method of claim 11, wherein the first two-photon transition manipulation signal and the second two-photon transition manipulation signal are not co-propagating.

18. The method of claim 11, wherein the atomic object is part of an object crystal comprising the atomic object and a qubit object and the atomic object is configured to sympathetically cool the qubit object.

19. The method of claim 18, wherein the first two-photon transition manipulation signal, the second two-photon transition manipulation signal, and the at least one repump manipulation signal are configured to cool multiple motional modes of the object crystal simultaneously.

20. The method of claim 11, wherein the at least one repump manipulation signal is characterized by a frequency that is on resonance with a transition from the second ground state to the at least one excited state.

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edspap.20250093740