|q⟩
Bad Qubits
Play
Quest
Questions
Learn
Playground
☕
← Question Bank
Multiple choice
Per this lesson, the Bell state |Phi+> is a pure two-qubit state. What is the reduced state of just one of its qubits (obtained by the partial trace)?
🔬 try it before you answer
The maximally mixed state I/2, with purity Tr(rho^2) = 1/2
Another entangled two-qubit state
A pure state |+>, with purity 1
The pure state |0>, since the qubits are correlated
Check answer