Lower bound on entanglement of formation for the qubit-qudit system
Lower bound on entanglement of formation for the qubit-qudit system
Wootters [PRL 80, 2245 (1998)] has derived a closed formula for the entanglement of formation (EOF) of an arbitrary mixed state in a system of two qubits. There is no known closed form expression for the EOF of an arbitrary mixed state in any system more complicated than two qubits. …