of using classical pulses during the entire gate
operation. The gate operation time scales as $sqrt{n}$ only and thus the gate
can be performed faster when compared with sending atoms through the cavity one
at a time. In addition, only three steps of operations are required for
realizing this $n$-target-qubit controlled phase gate. This proposal is quite
general, which can be applied to other physical systems such as various
superconducting qubits coupled to a resonator, NV centers coupled to a
microsphere cavity or quantum dots in cavity QED.
Realizing an $n$-target-qubit controlled phase gate in cavity QED: An approach without classical pulses
We propose a way to realize a multiqubit controlled phase gate with one qubit
simultaneously controlling $n$ target qubits using atoms in cavity QED. In this
proposal, there is no need