It means the holders are out of the competition at the fourth round.
Arteta reflected, "Very sad because we wanted to progress in the competition. Disappointed with the way we lost it and the way we conceded the goal but we know that we should not be doing that in that area of the pitch. Then when we had our moments and our chances, we didn't hit the target. That is really complicated to go through.
"This is a really high-pressing team and you have to be really sharp and know really well what you have to do in every area. Then it's about execution and it's about the way you lose that ball, in which areas you lose it against these types of teams. It's something that we have to be better at.
"You're not going to have 10 or 12 chances against this team. They're really organised, they make it hard for you. But when we have three or four, we didn't hit the target. It could've been a different game if we did."