Coherence Enhanced Optical Determination of the $$^{229}$$Th Isomeric Transition

Liao, Wei-Tung

doi:10.1007/978-3-319-02120-1_5

Cited by 6 publications

(18 citation statements)

References 72 publications

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“…This may become the next generation nuclear time standard, and provide many potential applications for metrology and cosmology, e.g., to study the time variation of physical constants. In addition to metrology, the nuclear clock transition provides a remarkable platform for developing nuclear quantum optics [147], studying the interplay between nuclei and its outer electrons [148], investigating quantum information [149] and building a γ-ray laser [150]. However, the basic problem in the thorium community is that the precise value of the isomeric transition energy is still unknown.…”

Section: Th Isomeric Transitionmentioning

confidence: 99%

“…The photon detector used to collect the signal is placed in the perpendicular direction to the propagation of VUV pulse. (b) Setup for measuring time spectra of nuclear forward scattering with a 229 Th:Crystal [147]; the photon detector is placed in the forward direction. The blue VUV pulse impinges on a Thorium doped crystal and partially excites the nuclei to the isomer state.…”

Section: Forward Detection Solves Some Critical Problemsmentioning

confidence: 99%

“…Thus, 20 Hz would suffice as counting rate of the NFS probe photons, i.e., a signal-background ratio greater than 10, and problem (3) is solved [147].…”

Section: Forward Detection Solves Some Critical Problemsmentioning

confidence: 99%

“…Two cases will be addressed here, the first one showed in (a) using only one probe pulse Ω p propagating through the crystal, and the second case demonstrated in (b) that uses a second field Ω c to affect the behavior of the first Ω p . Since thorium nuclei initially populate only the | Maxwell-Bloch equations [61,65,147]:…”

Section: Electromagnetically Modified Nfs With Onementioning

confidence: 99%

“…Further notations are Ω p(c) for the Rabi frequency of the probe (couple) VUV radiation [61,65,147], ∆ p(c) for the laser detuning of probe (couple) field and c the speed of light.…”

Section: γξ 2lmentioning

confidence: 99%

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Coherent Control of Nuclei and X-Rays

Liao

2014

Springer Theses

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The possibility of mutual control of nuclei and photons offered by the emerging field of nuclear quantum optics is theoretically investigated in three different applications. This extension of quantum optics towards nuclei is motivated by modern X-ray Free Electron Lasers (XFEL) which open the possibility to coherently control nuclear states. As a first application we investigate the coherent population transfer between nuclear states in a three-level system driven by an XFEL. Such a level scheme is relevant for the triggering of isomers and might play a role for future energy storage solutions. The other way around, nuclei offer a platform to control single x-ray photons, which can be focused on spots essentially smaller than a single atom and used in future photonic circuits. The second part of this thesis puts forward a nuclear forward scattering setup that allows coherent control of a single x-ray photon using 57 Fe nuclei. Finally, we show that nuclear quantum optics provides a significant improvement for detection in nuclear physics. The low-lying isomeric transition of 229 Th can be addressed by VUV lasers and provides a potential next generation frequency standard. A main impediment is the large uncertainty of the nuclear transition frequency. Using an electromagnetically modified nuclear forward scattering setup, we show that coherence effects can reduce this uncertainty down to an unprecedented level.Within the framework of this thesis, the following articles were published in refereed journals:

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Section: Th Isomeric Transitionmentioning

confidence: 99%

Section: Forward Detection Solves Some Critical Problemsmentioning

confidence: 99%

“…Thus, 20 Hz would suffice as counting rate of the NFS probe photons, i.e., a signal-background ratio greater than 10, and problem (3) is solved [147].…”

Section: Forward Detection Solves Some Critical Problemsmentioning

confidence: 99%

Section: Electromagnetically Modified Nfs With Onementioning

confidence: 99%

“…Further notations are Ω p(c) for the Rabi frequency of the probe (couple) VUV radiation [61,65,147], ∆ p(c) for the laser detuning of probe (couple) field and c the speed of light.…”

Section: γξ 2lmentioning

confidence: 99%

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Coherent Control of Nuclei and X-Rays

Liao

2014

Springer Theses

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Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter

Kazakov

Schauer

Schwestka

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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The Thorium-229 isotope features a nuclear isomer state with an extremely low energy. The currently most accepted energy value, 7.8±0.5 eV, was obtained from an indirect measurement using a NASA x-ray microcalorimeter with an instrumental resolution 26 eV. We study, how state-of-the-art magnetic metallic microcalorimeters with an energy resolution down to a few eV can be used to measure the isomer energy. In particular, resolving the 29.18 keV doublet in the γ-spectrum following the α-decay of Uranium-233, corresponding to the decay into the ground and isomer state, allows to measure the isomer transition energy without additional theoretical input parameters, and increase the energy accuracy. We study the possibility of resolving the 29.18 keV line as a doublet and the dependence of the attainable precision of the energy measurement on the signal and background count rates and the instrumental resolution.

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Optomechanically induced transparency of x-rays via optical control

Liao¹,

Pálffy²

2017

Sci Rep

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The search for new control methods over light-matter interactions is one of the engines that advances fundamental physics and applied science alike. A specific class of light-matter interaction interfaces are setups coupling photons of distinct frequencies via matter. Such devices, nontrivial in design, could be endowed with multifunctional tasking. Here we envisage for the first time an optomechanical system that bridges optical and robust, high-frequency x-ray photons, which are otherwise notoriously difficult to control. The x-ray-optical system comprises of an optomechanical cavity and a movable microlever interacting with an optical laser and with x-rays via resonant nuclear scattering. We show that optomechanically induced transparency of a broad range of photons (10 eV–100 keV) is achievable in this setup, allowing to tune nuclear x-ray absorption spectra via optomechanical control. This paves ways for metrology applications, e.g., the detection of the 229Thorium clock transition, and an unprecedentedly precise control of x-rays using optical photons.

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Coherence Enhanced Optical Determination of the $$^{229}$$Th Isomeric Transition

Cited by 6 publications

References 72 publications

Coherent Control of Nuclei and X-Rays

Coherent Control of Nuclei and X-Rays

Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter

Optomechanically induced transparency of x-rays via optical control

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