Abstract
We present a simple architecture for deterministic quantum circuits operating on single-photon qubits. Few resources are necessary to implement two elementary gates and can be recycled for computing with large numbers of qubits. The deterministic realization of some key multiqubit gates, such as the Fredkin and Toffoli gate, is greatly simplified in this approach.
Highlights
ArXiv:0909.0300v2 [quant-ph] 21 Sep 2009Quantum computing has attracted wide attention for its factoring power and efficient simulation of quantum dynamics
We propose an architecture for quantum logic gates operating on qubits encoded as the linear combinations of two single photon modes, e.g., |0L ≡ |H and |1L ≡ |V, where H and V are two polarization modes
In this architecture a quantum logic gate can be deterministically realized with a combination of two elementary gates
Summary
Quantum computing has attracted wide attention for its factoring power and efficient simulation of quantum dynamics. A two-qubit gate could be realized in an asymptotically deterministic way, as the number of photons forming an entangled state for teleportation in the protocol grows to infinity [1, 2]. It opens up the possibility of building any quantum logic gate which can be decomposed into two-qubit and singlequbit gates theoretically [3]. Qubits encoded as the linear combinations of two single photon modes, e.g., |0L ≡ |H and |1L ≡ |V , where H and V are two polarization modes In this architecture a quantum logic gate can be deterministically realized with a combination of two elementary gates. Because the qubits and ancillas are in simple quantum states, the operation error of the logic gates would be largely reduced
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