Quantum error correction for communication with linear optics

Article Abstract:

Cost-effective data transmission requires improved signal-to-noise ratios in optical communications systems. Quantum error correction is the only way to remove the effects of noise without corrupting the quantum states, but implementation is problematical as nonlinear operations are thought to be required. An efficient scheme that involves only linear optical elements and feedback is reported. It performs error correction in both quantum and classical noise.

Optical communications technologies, Optical communications, Signal to noise ratio

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Size isn't everything

Article Abstract:

A general limitation is derived by Lloyd Giovannetti for precision measurements that constrain the capacity to discover more about the world. Giovannetti show that the optimal accuracy achievable in estimating the value of black-box para-meter could be obtained in a simple circuit with N black boxes, running on an N-fold entangled state.

United States, Science & research, Evaluation, Mensuration, Measurement, Physics research

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Impossibility of deleting an unknown quantum state

Article Abstract:

A photon in an arbitrary polarization state cannot be perfectly cloned. It would be useful in quantum computation to store new information in an already computed state by deleting old information. However it is shown that the linearity of quantum theory does not enable the deletion of a copy of an arbitrary quantum state perfectly.

Quantum optics

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