Abstract
We demonstrate coherent control of both the rotational and hyperfine state of ultracold, chemically stable $^{87}$Rb$^{133}$Cs molecules with external microwave fields. We create a sample of ~2000 molecules in the lowest hyperfine level of the rovibronic ground state N = 0. We measure the transition frequencies to 8 different hyperfine levels of the N = 1 state at two magnetic fields ~23 G apart. We determine accurate values of rotational and hyperfine coupling constants that agree well with previous calculations. We observe Rabi oscillations on each transition, allowing complete population transfer to a selected hyperfine level of N = 1. Subsequent application of a second microwave pulse allows transfer of molecules back to a different hyperfine level of N = 0.
Highlights
We demonstrate coherent control of the rotational and hyperfine state of ultracold, chemically stable 87Rb133Cs molecules with external microwave fields
In this Rapid Communication, we report microwave spectroscopy of bosonic 87Rb133Cs in its ground vibrational state, and coherent state transfer from the absolute rovibrational and hyperfine ground state to a chosen single hyperfine state in either the first-excited or ground rotational states
We carry out the spectroscopy at two different magnetic fields ∼23 G apart; the field is calibrated using the microwave transition frequency between the |f = 3,mf = 3 and |f = 4,mf = 4 states of Cs
Summary
Such transfer can be achieved using a scheme proposed by Aldegunde et al [20] which employs microwave fields to manipulate the molecular hyperfine states This approach has been implemented for the fermionic heteronuclear molecules 40K 87Rb [21,22] and 23Na40K [23], leading to ground-breaking studies of the dipolar spin-exchange interaction [17] and nuclear-spin coherence time [19]. In this Rapid Communication, we report microwave spectroscopy of bosonic 87Rb133Cs in its ground vibrational state, and coherent state transfer from the absolute rovibrational and hyperfine ground state to a chosen single hyperfine state in either the first-excited or ground rotational states. The final two terms represent the tensor and scalar interactions between the nuclear magnetic moments, with tensor and scalar
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