PHYSICS · Multi-part · Fermi University Physics · Quantum Information & Technology · Quantum states, measurement and entanglement · Quantum states, measurement and entanglement
Quantum Information and Technology, Ch Entanglement as a resource
Problem
A Werner state ρW=w∣Ψ−⟩⟨Ψ−∣+(1−w)I/4 of two qubits has singlet weight w=0.9.
((a)) Find the eigenvalues of the partial transpose ρWTB and decide whether the state is entangled.
((b)) Find the largest CHSH value it can give and decide whether it violates the CHSH inequality.
((c)) Find the singlet fraction fs.
((d)) State the reduced density operator of each qubit.