He scratched his hair and glanced subconsciously across the street.
Chao Youye was also sitting on her bed, with her back against the wall, a thick English original monograph "Quantum Field Theory and Condensed Matter" on her knees, and a calculation paper full of complicated formulas spread out next to it.
The light from the desk lamp outlined his elegant features, his long eyelashes cast a faint shadow under his eyes, and his expression was focused and calm.
Mu Xinrong hesitated for a moment, but still walked to Chao Youye's bedside with his notebook in his arms and slippers on.
He didn't dare sit on it directly. He just squatted beside the bed, tilted his head, like a puppy waiting to be fed, and asked in a low voice: "Youye...are you asleep? I have a question for you..."
Chao Youye's gaze moved away from the pages of the book and fell on Mu Xinrong who was squatting beside the bed.
Under the warm yellow light, Mu Xinrong was wearing light blue pajamas, her hair was still a little wet, her eyes were clear and bright, with a hint of pleading and embarrassment.
He exuded the refreshing scent of soap, as if he had just showered, mixed with the clean scent unique to teenagers.
"Speak." Chao Youye's voice sounded particularly clear in the silent night.
Mu Xinrong immediately turned the laptop screen towards him and pointed at the lemma that was troubling him. "That's it. It's about proving the deformation of Bell's inequality under certain entangled states. I followed this line of thought, but I always feel like something's missing in the last step..."
Chao Youye put down the book in her hand, took the notebook, slid her slender fingers across the touchpad, and quickly scanned Mu Xinrong's derivation process.
His profile looked focused and charming under the light. After a moment, he picked up a pencil that he had placed beside him, pulled out a piece of calculation paper, and began to write quickly.
"Your line of thought is correct, but you've overlooked the impact of environmentally induced decoherence on the entanglement metric. Here," he pointed at a step in Mu Xinrong's derivation with the tip of his pen, "you should introduce a nonlocal correlation operator to correct the skewness of the density matrix."
As he spoke, he quickly wrote down a few lines of concise but crucial formulas and derivations on the paper.
His handwriting was clear and powerful, and the logical chain was linked together. Mu Xinrong squatted beside him, reading intently, breathing lightly.
The crisp and clean scent of Chao Youye lingered at the tip of his nose. His focused profile was so close that he could even see the very light hairs on his delicate skin.
A mixture of admiration, peace of mind and indescribable throbbing quietly spreads in my heart.
"Do you understand?" Chao Youye stopped writing and handed him the calculation paper.
Mu Xinrong woke up as if from a dream and quickly took it. Looking at the few lines of brilliant deduction on the paper, he suddenly understood: "I understand! It's so clear! Youye, you are amazing!"
He exclaimed sincerely, his eyes shining brightly.
Chao Youye didn't say anything, just looked at his eyes that were shining with excitement.
Under the light, those eyes seemed to be filled with tiny starlight, pure and warm.
The fingers on his legs curled up unconsciously, and a strange, slightly itchy feeling quietly grew in his heart.
"Yeah." He replied softly and picked up his book again. "It's late, go to bed."
"Okay! You should go to bed early too!" Mu Xinrong returned to his bed contentedly, holding his notebook and calculation paper. He felt full of energy, and even the chill of late autumn was dispelled.
Chao Youye's eyes fell on the pages of the book, but she didn't turn them for a long time. Mu Xinrong's clear voice and the undisguised admiration of "really amazing" seemed to linger in her ears.
He tilted his head slightly to look at Mu Xinrong, who was lying on the bed opposite him, already opening his laptop and returning to work. The warm yellow light outlined his focused silhouette, his fingers tapping on the keyboard, making a subtle clicking sound.
The sound was not noisy, but rather like a regular heartbeat, with a strange soothing power.
Chao Youye withdrew his gaze and looked back at the profound monograph in his hand. Those complex symbols and formulas no longer seemed so cold and hard.
He gently turned a page, his fingertips brushing against the touch of the pages with a hint of imperceptible softness.
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