Symmetry analyzer for nondestructive Bell-state detection using weak nonlinearities

By S. Barrett, Pieter Kok, Kae Nemoto, Raymond G. Beausoleil, W. J. Munro, T. Spiller. 2004

263 citations recorded by the source corpus.

We describe a method to project photonic two-qubit states onto the symmetric and antisymmetric subspaces of their Hilbert space. This device utilizes an ancillary coherent state, together with a weak cross-Kerr nonlinearity, generated, for example, by electromagnetically induced transparency. The symmetry analyzer is nondestructive, and works for small values of the cross-Kerr coupling. Furthermore, this device can be used to construct a nondestructive Bell-state detector.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/f5351592269771dc95453979f7e9e0f4a3088720

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

Citations in the corpus

Quantum memories: emerging applications and recent advances (2015, background): “Successful implementations of optical non-linearity enable photonic two-qubit gates [261] and non-destructive Bell-state detection [262], and photon switching [263–267].”
Linear optical quantum computing with photonic qubits (2005, methodology): “It was shown by Munro et al. (2005) how such nonlinearities can make a number-resolving QND detector, and Barrett et al. (2005) showed how a small cross-Kerr nonlinearity can be used to perform complete Bell measurements without destroying the photons.”