Non-destructive state detection for quantum logic spectroscopy of molecular ions
| Autor: | Yong Wan, Florian Gebert, Fabian Wolf, Chunyan Shi, Piet O. Schmidt, Jan C. Heip |
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| Rok vydání: | 2015 |
| Předmět: |
Quantum Physics
Multidisciplinary Chemistry Atomic Physics (physics.atom-ph) FOS: Physical sciences 01 natural sciences Physics - Atomic Physics 010305 fluids & plasmas Dipole Dark state Quantum state Laser cooling 0103 physical sciences Quantum metrology Energy level Physics::Atomic Physics Atomic physics 010306 general physics Spectroscopy Quantum Physics (quant-ph) Trapped ion quantum computer |
| Zdroj: | Nature. 530(7591) |
| ISSN: | 1476-4687 |
| Popis: | Laser spectroscopy of cold and trapped molecular ions is a powerful tool for fundamental physics, including the determination of fundamental constants, the laboratory test for their possible variation, and the search for a possible electric dipole moment of the electron. Optical clocks based on molecular ions sensitive to some of these effects are expected to achieve uncertainties approaching the $10^{-18}$ level. While the complexity of molecular structure facilitates these applications, the absence of cycling transitions poses a challenge for direct laser cooling, quantum state control, and detection. Previously employed state detection techniques based on photo-dissociation or chemical reactions are destructive and therefore inefficient. Here we experimentally demonstrate non-destructive state detection of a single trapped molecular ion through its strong Coulomb coupling to a well-controlled co-trapped atomic ion. An algorithm based on a state-dependent optical dipole force(ODF) changes the internal state of the atom conditioned on the internal state of the molecule. We show that individual states in the molecule can be distinguished by their coupling strength to the ODF and observe black-body radiation-induced quantum jumps between rotational states. Using the detuning dependence of the state detection signal, we implement a variant of quantum logic spectroscopy and improve upon a previous measurement of the $\mathrm{X}^1\Sigma^+(J=1)\rightarrow\mathrm{A}^1\Sigma^+(J=0)$ transition in MgH, finding a frequency of 1067.74752(53)THz. We estimate that non-destructive state detection with near 100% efficiency could take less than 10 ms. The technique we demonstrate is applicable to a wide range of molecular ions, enabling further applications in state-controlled quantum chemistry and spectroscopic investigations of molecules serving as probes for interstellar clouds. |
| Databáze: | OpenAIRE |
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