Controlled Production of Subradiant States of a Diatomic Molecule in an Optical Lattice

Takasu, Yoshio; Saito, Yutaka; Takahashi, Yoshiro; Borkowski, Mateusz; Ciuryło, R.; Julienne, Paul S.

doi:10.1103/physrevlett.108.173002

Cited by 53 publications

(50 citation statements)

References 24 publications

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“…[20] the authors propose a combined optical/solidstate approach to realize a quantum processor based on "subradiant dimers" of quantum dots, resonantly coupled by dipole-dipole interaction and implanted in low-temperature solid host materials at controllable nanoscale separations. Other works focused on the controlled production of superradiant and subradiant states when the artificial atomic systems are tightly confined in optical lattices [21] or in quantum electrodynamics (QED) circuits [22]. In this framework, the main aim of the present paper is to investigate the influence of a structured environment on the collective spontaneous emission of a system of two identical correlated atoms.…”

Section: Introductionmentioning

confidence: 99%

Tuning the collective decay of two entangled emitters by means of a nearby surface

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Rizzuto

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.We consider the radiative properties of a system of two identical correlated atoms interacting with the electromagnetic field in its vacuum state in the presence of a generic dielectric environment. We suppose that the two emitters are prepared in a symmetric or antisymmetric superposition of one ground state and one excited state and we evaluate the transition rate to the collective ground state, showing distinctive cooperative radiative features. Using a macroscopic quantum electrodynamics approach to describe the electromagnetic field, we first obtain an analytical expression for the decay rate of the two entangled twolevel atoms in terms of the Green's tensor of the generic external environment. We then investigate the emission process when both atoms are in free space and subsequently when a perfectly reflecting mirror is present, showing how the boundary affects the physical features of the superradiant and subradiant emission by the two coupled emitters. The possibility to control and tailor radiative processes is also discussed.

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Section: Introductionmentioning

confidence: 99%

Tuning the collective decay of two entangled emitters by means of a nearby surface

Palacino

Passante

Rizzuto

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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“…In particular, the internal symmetries of homonuclear diatomic molecules result in formation of two-body superradiant and subradiant excited states. While superradiance [1][2][3] has been demonstrated in a variety of systems, subradiance [4][5][6] is more elusive due to the inherently weak interaction with the environment. Here we characterize the properties of deeply subradiant molecular states with intrinsic quality factors exceeding 10 13 via precise optical spectroscopy with the longest molecule-light coherent interaction times to date.…”

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confidence: 99%

Precise study of asymptotic physics with subradiant ultracold molecules

et al. 2014

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Weakly bound molecules have physical properties without atomic analogues, even as the bond length approaches dissociation. In particular, the internal symmetries of homonuclear diatomic molecules result in formation of two-body superradiant and subradiant excited states. While superradiance [1][2][3] has been demonstrated in a variety of systems, subradiance [4][5][6] is more elusive due to the inherently weak interaction with the environment. Here we characterize the properties of deeply subradiant molecular states with intrinsic quality factors exceeding 10 13 via precise optical spectroscopy with the longest molecule-light coherent interaction times to date. We find that two competing effects limit the lifetimes of the subradiant molecules, with different asymptotic behaviors. The first is radiative decay via weak magnetic-dipole and electric-quadrupole interactions. We prove that its rate increases quadratically with the bond length, confirming quantum mechanical predictions. The second is nonradiative decay through weak gyroscopic predissociation, with a rate proportional to the vibrational mode spacing and sensitive to short-range physics. This work bridges the gap between atomic and molecular metrology based on lattice-clock techniques [7], yielding new understanding of long-range interatomic interactions and placing ultracold molecules at the forefront of precision measurements.Simple molecules provide a wealth of opportunities for precision measurements. Their richer internal structure compared to atoms enables experiments that push the boundaries in determinations of the electric dipole moment of the electron [8], the electron-to-proton mass ratio and its variations [9,10], and parity violation [11]. Diatomic molecules are moving to the forefront of manybody science [12] and quantum chemistry [13], providing glimpses into fundamental laws [14]. However, this attractive complexity of molecular structure has historically posed difficulties for manipulation and modeling [15]. This work removes many of these barriers by employing techniques of optical lattice atomic clocks [16,17] to control the quantum states of weakly bound homonuclear diatomic strontium molecules, in particular by using state-insensitive optical lattices [18] for molecular transitions with three types of optical transition moments. We observe strongly forbidden optical transitions in this asymptotic diatomic system, an ideal regime for studying the breakdown of the ubiquitous dipole approximation where the size of the quantum particle is a significant fraction of the resonant wavelength. We explain these observations with a state-of-the-art ab initio molecular model [19] and asymptotic scaling laws. The results prove that the quantum mechanical effect of subradiance can be exploited for precision spectroscopy, and demonstrate the promise of combining precise state control, coherent manipulation, and accurate ab initio calculations with recently available ultracold molecular systems.We create Sr 2 molecules by photoassociation [20] from ...

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“…The unusually fast time scale (0.25 s) of ultracold molecule production is particularly important for establishing a short duty cycle in metrological applications. Furthermore, there is active interest in exploring molecules of alkaline-earth-metal (and the isoelectronic Yb) atoms in various combinations with each other and with alkali-metal atoms, such as Sr 2 , Yb 2 , LiYb, RbYb, RbSr, and SrYb [17][18][19][20][21][22][23].…”

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confidence: 99%

Optical Production of Stable UltracoldSr288Molecules

et al. 2012

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We have produced large samples of stable ultracold 88 Sr2 molecules in the electronic ground state in an optical lattice. The fast, all-optical method of molecule creation involves a nearintercombination-line photoassociation pulse followed by spontaneous emission with a near-unity Franck-Condon factor. The detection uses excitation to a weakly bound electronically excited vibrational level corresponding to a very large dimer and yields a high-Q molecular vibronic resonance. This is the first of two steps needed to create deeply bound 88 Sr2 for frequency metrology and ultracold chemistry.PACS numbers: 67.85. 34.50.Rk, 37.10.Jk, 37.10.Pq The rapid progress in laser cooling has given rise to many new fields of research. One important example is the study of ultracold, dense clouds of molecules. The molecules can exhibit new physical phenomena near quantum degeneracy [1][2][3]. For example, long-range anisotropic interactions are expected between heteronuclear polar molecules. Such molecules have also been explored as a paradigm for quantum information and computation [4]. On the other hand, homonuclear molecular dimers without a dipole moment present a metrological interest, for example in constraining the variation of the electron-proton mass ratio [5,6] or complementing atomic clocks by serving as time standards in the terahertz regime [6]. These molecules also provide an excellent testing ground for many possible approaches to creating large ultracold samples, trapping them to allow long interrogation times, and precisely controlling their quantum states. The four promising routes toward trapped neutral molecules [1] are direct control of polar molecule dynamics via electric fields; buffer gas cooling of magnetic species; direct laser cooling of a suitable class of molecules [7]; and using magnetic or optical fields to combine laser cooled atoms into dimers [8][9][10][11][12]. The latter process typically results in molecules with relatively small binding energies but nonetheless has played a major role in the study of new phenomena. These dimers are also most promising for quantum control, since they are routinely produced at sub-µK temperatures.In this Letter, we describe optical production of 88 Sr 2 in the electronic ground state in an optical lattice. In contrast to alkali-metal atoms, Sr atoms possess no electronic spin and cannot be combined into molecules via the magnetic Feshbach resonance technique [13]. However, Sr has the advantage of the intercombination (spinforbidden) transition from the ground state, 1 S 0 − 3 P 1 (7 kHz linewidth [14], 689 nm wavelength), which allows Doppler cooling to < 1 µK [15] and provides several features that enable efficient photoassociation (PA) into molecules [14,16]. The unusually fast time scale (0.25 s) of ultracold molecule production is particularly important for establishing a short duty cycle in metrological applications. Furthermore, there is active interest in exploring molecules of alkaline-earth-metal (and the isoelectronic Yb) atoms in various combina...

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Controlled Production of Subradiant States of a Diatomic Molecule in an Optical Lattice

Cited by 53 publications

References 24 publications

Tuning the collective decay of two entangled emitters by means of a nearby surface

Tuning the collective decay of two entangled emitters by means of a nearby surface

Precise study of asymptotic physics with subradiant ultracold molecules

Optical Production of Stable UltracoldSr288Molecules

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