I read this short fiction about 10-15 years ago but of course it might have been written long before, I don't remember what collection it was in. It was about a short novelette length, maybe technically still a "short story" but not a short-short one.
The main character is a woman physicist, specialist in quantum mechanics. She attends a big scientific conference. There she meets another QM physicist, a man, whom she met already at one (or more) similar conferences and had, at that time expressed his romantic interest in her, very nicely and politely, but she had declined. And she keeps declining when he expresses it again. Note that though he is persistent he is never harassing her, always very nice and polite. Still, in order not to pain him, she tries to avoid him. It is a big conference, with parallel talks at the same time. Also there are lots of various restaurants around, and various things to do during recesses. But though she tries to make decisions at the last moment so he cannot know what talk, restaurant or whatever she chooses, whenever there is a choice, he is always there when she arrives. But it is not through spying, it does not look like "magic" in a "fantasy story", nor some kind of SF "mind reading". No, the writer manages to convey the idea that they are like "quantum entangled particles."
It is really very well done. In the end, she finally admits to herself that she really is attracted to the guy and all's well that ends well.
When I read it, I knew of course whether the author was a man or a woman, but now I forgot the author's name. However, I think that at that time I thought that indeed, only a woman could have written that. But this might be a false, fabricated memory.
In answer to some remarks below
- It was definitely in an SF collection. As user14111 pointed out, that seems to me a good definition of a SF story.
- The man never used the expression "entangled particles". It is the reader who comes to this conclusion due to clues the author gives. The titles of the talks to which they attend, things like that.
- Also, the man definitely does not harass the woman. He does not follow her. She goes someplace at random, and just bumps into him, he was there already.
- @ Invisible Trihedron Bellwether is a novel, and my story is not that long, though it might be technically a novelette, I don't remember exactly enough. But Connie Willis, that rings a bell. She is a woman, in particular. However, even if it is by her (and I am not sure) she wrote so many stories... Another suggestion ?