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Manipulating and Measuring States of...

Wang, Yiqi.

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Manipulating and Measuring States of a Superfluid Optomechanical Resonator in the Quantum Regime.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Manipulating and Measuring States of a Superfluid Optomechanical Resonator in the Quantum Regime./
作者:	Wang, Yiqi.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	278 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-08, Section: B.
Contained By:	Dissertations Abstracts International85-08B.
標題:	Quantum physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30632142
ISBN:	9798381438017

Manipulating and Measuring States of a Superfluid Optomechanical Resonator in the Quantum Regime.
Wang, Yiqi.

Manipulating and Measuring States of a Superfluid Optomechanical Resonator in the Quantum Regime. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 278 p.

Source: Dissertations Abstracts International, Volume: 85-08, Section: B.

Thesis (Ph.D.)--Yale University, 2023.

Quantum optomechanics describes utilizing optics to precisely manipulate and read out the motional degrees of freedom of a mechanical oscillator. If the mechanical oscillator is very weakly coupled to its environment, then the optomechanical interaction can be used to control the state of the mechanical oscillator in a quantum way. Applying these systems to advanced sensing techniques has inaugurated experiments on dark matter searches, gravitational wave detection, quantum gravitational phenomena tests, and sensing beyond the standard quantum limit. I am motivated by asking: "What is the largest and most tangible object to reveal purely quantum phenomena?" In addition, I seek to use mechanics to explore quantum-enhanced applications.In this thesis, I describe my work toward preparing quantum states of mechanical motion in a cavity optomechanical system. The system is a Fabry-Perot cavity that is filled ´ with superfluid helium. A density wave of the helium serves as the mechanical resonator, whose effective mass is ∼1 ng. The radiation pressure of the light is used as a gentle quantum "drumstick" to control the motion of the helium, while the helium, in exchange, imprints information about its motion on the emitted light. For such a large object, a myriad of different factors conspire to mask quantum effects. However, I can circumvent some of the obstacles by leveraging the material properties of superfluid helium and by using single-photon counting techniques.In the experiment, I manipulated and characterized the state of the mechanics through optomechanical coupling and by performing photon counting measurements on the scattered light. I measured this mechanical resonator's second/third/fourth-order coherence functions while it was in a thermal state with less than three phonons. In addition, I drove this mechanical resonator to a nearly coherent state. The state had around two phonons' worth of fluctuations while its amplitude corresponded to 4 x 104 phonons. More striking quantum effects are related to states that are excluded by classical theories. Following the DLCZ protocol, I conditionally prepared non-classical photon-phonon entangled states. Their photon-phonon coherences violated a classical bound set by Cauchy-Schwarz inequality with a four-sigma significance.I will also discuss our next steps using an even larger cavity to observe more macroscopic and more striking quantum features. Such a system shows prospects for dark matter detection, gravitational wave detection, and testing non-standard modified quantum theory.

ISBN: 9798381438017Subjects--Topical Terms:

726746
Quantum physics.
Subjects--Index Terms:

Optomechanics

Manipulating and Measuring States of a Superfluid Optomechanical Resonator in the Quantum Regime.
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