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1. Is my opening too tacky?

2. Do I talk too much about research experience? Maybe I should cut some details out.

3. On the contrary, I feel that I do not state the research area I would like to pursue in enough depth. Should I write more about what to do in the future? But the context should be limited to one page and my current SOP reaches the limit, and I am afraid that I may accidentally propose some wrong ideas.

4. I barely state my interest in the campus and environment. Is this point important to the admission committee?

Thanks for your reading and for any advice.

"What is the nature of the universe? What is our place in it and where did it and we come from? Why is it the way it is?" The book,A Brief History of Time, was always kept beside my pillow when I was a high school student. The mystery of nature inspired me to learn physics well in high school. Yet, as a teenager, I was not clear about my future career, so I determined to follow others' suggestions and chose Automation as my major. However, after working for several years, I felt I need to go back to school and pursuit my academic career. I tried to learn Computer Science, Artificial Intelligence, but in the end, I found that only Physics intrigues me the most. After self-learning physics for three years, I was successfully matriculated as a graduate student at University A, and my path to becoming a physicist truly depart since then.

In my first year of graduate study, I enrolled in and aced some courses based on my interest, such as Advanced Quantum Mechanics, General Relativity, Group Theory, and Advanced Optics. I believe I have left an impression on the professors as an enthusiastic, proactive, and industrious student, since I frequently asked questions and shared opinions with my professors and classmates. In the meantime, I started to read papers in various areas, and finally, I decided to research the cross-section between quantum theory and general relativity. My supervisor guided me to study how high-dimensional entanglements evolve under the impact of gravitational fluctuations. It did not start well in the first place. I have no clear thoughts about the project, so I had to continue searching for different models from every aspect. Most of them turned out to be unfit and I felt depressed after several months. But what the pains paid is the fulfillment when I finally constructed a successful model, and the accumulating failures led to a deeper understanding and more clear calculations. Since then, my supervisor allowed me to explore other projects of my own will. I decided to deeper my understanding of the entanglements in the relativistic world, so I studied the degradation of entanglement due to the Unruh effect, and the conversion between photons and gravitons in strong magnetic fields. The results of my work have theoretical significance by offering a tool for detecting gravitons with orbital angular momentum, a key to future quantum communication, and a messenger from the early Universe. Based on my current work, I have finished three manuscripts. The one about the degradation of entanglement in gravitational fluctuations has been published inPhysical Review D, while the other two manuscripts are still under review.

In the last years of studying, I grow an interest in quantum gravity. Currently, quantum mechanics and general relativity, the two most successful theories, have not been unified yet. There are many candidate theories, such as superstring theory, loop quantum gravity, supergravity, etc., aiming to accomplish this goal. In addition, no experiments have been conducted to test those theories and I believe the decoherence and entanglement degradation could be used as tabletop experiments available in the near future. From the University B, I get to know about Professor S's work regarding gravitational decoherence. In his group, they develop a new quantum gravity theory, the Correlated WorldLine (CWL) theory, which can be used to study the decoherence phenomena of large massive objects. I believe it is a promising theory and I would like to pursue my academic career along this path under the supervision of Professor S. My research in entanglement degradation has provided me with unique insights into gravitational decoherence. For example, I believe the dimension of a quantum system plays an important role, according to my work. I would like to explore this feature further under the quantum gravity framework. Also, Normally quantum gravity only shows itself on extremely small scales, and this hinders experiment designs for quantum gravity. I think the other way for testing quantum gravity theories lies in the early Universe, where extreme conditions may induce observable quantum gravity effects. Thus I am confident in my choice of further research and in my preparation for pursuing it. I wish after four years of study, I could extend the theory in a deeper depth, strengthen my understanding of the decoherence process, and explore entanglements in different scenarios. Meanwhile, I will keep my mind open to other possible theories. I expect the combination of different theories could result in a more comprehensive understanding of Nature.

Lastly, I believe University B is the perfect location for my next academic stage, not only because of its academic innovation and integrity but because it has a beautiful and inspirational environment. I welcome the opportunity to spend weekends exploring the beautiful areas of C. I wish to continue my passion for physics in University B's Ph.D. program, and I would be honored to join the large community of faculty and students interested in physics.