【摘 要】
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The existence of decoherence-free subspace (DFS) has been discussed widely.In this paper,we propose an alteative scheme for generating the four-atom W states by
【机 构】
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Department of Electronic Science and Applied Physics,Fuzhou University,Fuzhou 350002,China
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The existence of decoherence-free subspace (DFS) has been discussed widely.In this paper,we propose an alteative scheme for generating the four-atom W states by manipulating DF qubits.The atoms are divided into two pairs and trapped in two separate optical cavities.Manipulation of atoms within DFS may generate a two-atom maximally entangled state in an individual cavity,which is a stable state.After driving the system out of DFS,the atoms will interact resonantly with the cavity field.The photons leaking from the cavities interfere at the beamsplitter,which destroys which-path information,and are finally detected by one of the detectors,leading to the generation of a W state.In addition,the numerical simulation indicates that the fidelity of the prepared state can,for a very wide parameter regime,be very close to unity.
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