Southwest Quantum Information and Technology

Entanglement is not Enough

Leonard Susskind, Stanford University

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Two things make quantum physics very different from classical physics: entanglement, and the capacity for exponential complexity. The role of entanglement in the quantum theory of black holes is well established. But entanglement is not enough; long after entanglement has reached its maximum, complexity in a chaotic quantum system continues to increase. The increase of complexity is deeply related to the interiors of black holes in ways that suggest deep connections between complexity and space-time geometry. I will explain some of the ways in which quantum information theory is leading you a much deeper understanding of black holes. Entanglement and quantum computational complexity play a key role in the emergence of space behind the horizon.