Quantum foundations
Measurement, gravity, and black holes challenge our account of quantum physics.
10 problemsQuantum physics
Quantum phenomena and the foundations of their description.
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Browse collectionsQuantum matter
Superconductivity, charge order, fractional excitations, and slow quantum dynamics.
11 problemsA few problems to explore
11 totalQuantum gravity
Gravity describes a changing spacetime. Quantum physics describes matter and its possibilities. How should they work together in a single physical account?
Quantum measurement problem
A single photon gives a left or right detector click. Quantum theory predicts the odds, but treating the detectors quantum mechanically produces a superposition of possible records. How should that state account for a definite result?
Black hole information problem
If a black hole evaporates, how is the information about what fell into it represented in what comes out? The answer must reconcile quantum evolution with gravitational calculations.
Cuprate pairing mechanism
What microscopic interaction produces superconducting electron pairs across the cuprate phase diagram?
Hole-doped cuprate pseudogap
Why do hole-doped cuprates lose low-energy electronic states before superconductivity appears?
Charge order in kagome superconductors
Why does charge order break symmetry differently across the AV3Sb5 kagome superconductor family?