Universal hybrid hyper-controlled quantum gates assisted by quantum dots in optical double-sided microcavities

Exploiting the giant optical circular birefringence induced by the double-sided quantum-dot-cavity system, we construct a deterministic hybrid hyper-controlled-not (hyper-CNOT) gate, in which the spatial-mode and polarization states of a photon act as the two control qubits, whereas two stationary electron spins in quantum dots confined inside the optical microcavities serve as the two target qubits. In our scheme, the control qubits are easily manipulated with simple optical elements and the target qubits are suitable for storage and processing use. With our hybrid hyper-CNOT gates, we design a high-capacity direct transmission quantum communication network which requires neither the establishment of entanglement between remote locations nor the use of long-lived quantum memories. We discuss the feasibility and efficiency of our hybrid hyper-CNOT gate, concluding that it is feasible with current technology.