What are the advantages and disadvantages of path encoded qubits and polarization encoded qubits , respectively ?
Why does a linear operator -LSB- math -RSB- V_x -LSB- \ math -RSB- acting upon a certain register of qubits in state -LSB- math -RSB- \ phi -LSB- \ math -RSB- mean that the system is working in quantum parallel ? Is n't it true that we can send multiple classical bits on a register through an operator at the same time ?