本文關(guān)鍵詞： 金剛石氮空位中心 自旋操控 微波天線 近場(chǎng)輻射　出處：《中北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：作為一種新型的量子系統(tǒng),金剛石氮空位(Nitrogen-vacancy,NV)色心憑借其在室溫下較長的相干時(shí)間、固態(tài)易集成等優(yōu)勢(shì)受到越來越多的關(guān)注。金剛石氮空位色心可以在激光作用下進(jìn)行初始化和讀出,可以通過微波作用對(duì)其自旋態(tài)進(jìn)行操控,被視為最有希望的自旋載體材料之一。利用單NV色心已經(jīng)實(shí)現(xiàn)了對(duì)磁場(chǎng)、溫度、電場(chǎng)、角速率的物理量的測(cè)量。相比于單NV色心,系綜NV色心可以激發(fā)出較強(qiáng)的熒光,熒光收集方法簡單,熒光收集率高,是未來量子傳感實(shí)用化的必然趨勢(shì)。系綜NV色心容易與復(fù)雜環(huán)境進(jìn)行耦合而導(dǎo)致相干性快速消失,這使得對(duì)自旋的測(cè)量和操控難度加大,因此在自旋態(tài)操控時(shí)要求有輻射性能更好的微波場(chǎng)和精度更高的時(shí)序控制�；诖吮疚倪M(jìn)行了以下研究:第一,從理論上研究了NV色心的性質(zhì)及微波對(duì)NV色心自旋的作用,得到了微波功率與共振信號(hào)的關(guān)系,同時(shí)對(duì)自旋態(tài)操控理論進(jìn)行了研究。第二,為了提高天線近場(chǎng)輻射性能,設(shè)計(jì)了新型的微波輻射天線,并對(duì)天線結(jié)構(gòu)進(jìn)行了優(yōu)化,通過HFSS仿真、近場(chǎng)測(cè)試及共振信號(hào)測(cè)試對(duì)傳統(tǒng)銅絲天線和新型微帶天線的輻射性能進(jìn)行了對(duì)比,證明了微帶天線在系綜金剛石NV色心自旋態(tài)操控研究中的優(yōu)越性。第三,開發(fā)了系綜NV色心高精度時(shí)序操控軟件系統(tǒng),通過上位機(jī)軟件實(shí)現(xiàn)了整個(gè)系統(tǒng)的自動(dòng)化控制。系統(tǒng)可以通過任意編碼輸出高精度脈沖組合調(diào)控時(shí)序,實(shí)現(xiàn)了對(duì)微波、激光等的控制,同時(shí)軟件具有熒光信號(hào)采集功能。本研究為實(shí)現(xiàn)利用微波操控系綜NV色心自旋態(tài)奠定了基礎(chǔ),促進(jìn)了基于NV色心的量子傳感實(shí)用化進(jìn)程。
[Abstract]:As a new quantum system, diamond nitrogen vacancy NVN centers depend on their long coherent time at room temperature. More and more attention has been paid to the advantages of easy integration of solid state. The diamond nitrogen vacancy color center can be initialized and read out by laser, and the spin state can be controlled by microwave. The single NV color center has been used to measure the physical quantities of magnetic field, temperature, electric field and angular rate. Compared with the single NV color center, ensemble NV color center can excite strong fluorescence. The fluorescence collection method is simple and the fluorescence collection rate is high, which is the inevitable trend of quantum sensing in the future. The color center of ensemble NV is easily coupled with the complex environment, which leads to the rapid disappearance of coherence, which makes it more difficult to measure and manipulate the spin. Therefore, microwave field with better radiation performance and timing control with higher precision are required in spin state manipulation. Based on this, the following studies are carried out: firstly, the properties of NV color center and the effect of microwave on NV color center spin are studied theoretically. The relationship between microwave power and resonance signal is obtained, and the spin control theory is also studied. Secondly, in order to improve the near-field radiation performance of the antenna, a new type of microwave radiation antenna is designed, and the antenna structure is optimized. The radiative performance of traditional copper wire antenna and new type of microstrip antenna is compared by HFSS simulation, near field test and resonance signal test. The superiority of microstrip antenna in the study of color center spin control of ensemble diamond NV is proved. The high precision timing control software system of ensemble NV color center is developed, and the automatic control of the whole system is realized by the upper computer software. The control of laser and the software have the function of fluorescence signal acquisition. This study has laid a foundation for using microwave to control the spin state of ensemble NV color center and promoted the practical process of quantum sensing based on NV color center.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O413;TN015;TN820

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本文編號(hào)：1554961