School of Science Department of Physics 61 Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: CHAN Cheuk Wang / PHYS HUNG Ka Ho / PHYS Course: UROP 1100, Fall UROP 1100, Fall A cryostat is an essential experimental apparatus that enables the creation of ideal conditions for investigating specific properties of NV (nitrogen-vacancy) centers. NV centers, which are found in diamonds, exhibit remarkable quantum properties and can be used to probe the properties of many-body systems through interactions with the surrounding environment. By employing a cryostat, ultra-low temperatures and pressures can be achieved, creating a controlled environment that allows for precise measurements of NV center properties. This report aims to introduce the mechanisms of the cryostat, followed by a detailed explanation of the process of how the cryostat was modified and a conclusion. Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: CHEUNG Chun Fung / PHYS Course: UROP 1100, Spring Nitrogen vacancy defect centres in diamond are an emerging research topic that has a lot of potential in quantum computing and sensing in extreme environments. Information can be stored in the spins of these defect centres to keep track of computational inputs or changes in external fields, and their spins are determined by shining laser beams on them and detecting their fluorescence due the different reactions to light by NV centres of different spins. To cause minimal disturbances to the system, we can perform single shot measurements by making use of a 594nm He-Ne laser and an acoustic optical modulator to create pulsed laser shots. We constructed a circuit and optical table setup to control these two devices, allowing for improved measurements for future experiments. Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: HUNG Ka Ho / PHYS Course: UROP 2100, Summer In order to create an ideal condition for investigating specific properties of NV (nitrogen-vacancy) centers, a cryostat is necessary for the experiment. NV centers, which are defects in diamonds, exhibit unusual quantum properties and can be used to probe the properties of many-body systems when they interact with the surrounding environment. By applying a cryostat, an ultra-low temperature and pressure can be achieved, creating a controlled and ideal condition for precise measurement of NV center properties. This report aims to introducing the mechanisms of the cryostat, followed by a detailed explanation of the improvement of the cryostat compared to that in the previous report and the plan used to experiment.
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