Direct conversion of Greenberger–Horne–Zeilinger state to Knill–Laflamme–Milburn state in decoherence-free subspace
Lei Chen, Xiao-Ming Xiu, Li Dong, Nan-Nan Liu, Cai-Peng Shen, Shou Zhang, Shu Chen, Shi-Lei Su
Abstract
Several schemes are proposed to realize the conversion of photonic polarized-entangled Greenberger-Horne-Zeilinger state to Knill-Laflamme-Milburn state in decoherence-free subspace (DFS) via weak cross-Kerr nonlinearity and X-quadrature homodyne measurement with high fidelity. DFS is introduced to decrease the decoherence effect caused by the coupling between the system and the environment. Optimizations to improve the success rate and utilization of residual states are further investigated. This study indicates important applications for quantum information processing in the future.
Topics & Concepts
Quantum decoherenceHomodyne detectionSubspace topologyState (computer science)PhysicsNonlinear systemPhotonicsResidualOpticsQuantum opticsCoupling (piping)Quantum mechanicsNonlinear opticsSignal processingDirect-conversion receiverStatistical physicsQuantum information processingQuantum channelQuantum stateCoherent statesQuantumComputer scienceQuantum informationSpontaneous parametric down-conversionQuantum computerQuantum key distributionTopology (electrical circuits)Heterodyne detectionElectronic engineeringQuantum networkPhoton countingInformation processingPulse shapingQuantum metrologyAlgorithmW stateQuantum information scienceLaserCoupled mode theoryMathematicsQuantum Information and CryptographyOptical Network TechnologiesNeural Networks and Reservoir Computing