We analyze the long-time behavior of a quantum computer running a quantum error correction QEC code in the presence of a correlated environment. Starting from a Hamiltonian formulation of realistic noise models, and assuming that QEC is indeed possible, we find formal expressions for the probability of a given syndrome history and the associated residual decoherence encoded in the reduced densi...

BACKGROUND Carpal tunnel syndrome (CTS) is common in the industrial setting. However,there is a controversy about the sole role of occupational ergonomic hazards in CTS. OBJECTIVES This study was conducted among assembling workers of a detergent factory and computer users with the aims of A) determination of CTS prevalence and B) evaluation of personal risk factors and level of exposure to oc...

The quantum computing devices of today have tens to hundreds qubits that are highly susceptible noise due unwanted interactions with their environment. theory error correction provides a scheme by which the effects such on states can be mitigated, paving way for realising robust, scalable computers. In this article we survey current landscape correcting (QEC) codes, focusing recent theoretical ...

Musculoskeletal disorders (MSDs) are a common health problem throughout the world and a major cause of disability among the work force. Assessment of exposure level to MSD risk factors can be an appropriate base for planning and implementing interventional ergonomic programs in the workplace. This study was conducted among workers of an Iranian rubber factory with the objectives of (a) determin...

Keeping single-qubit quantum coherence above some threshold value not far below unity is a prerequisite for fault-tolerant quantum error correction (QEC). We study the initial dephasing of solidstate qubits in the independent-boson model, which describes well recent experiments on quantum dot (QD) excitons both in bulk and in substrates of reduced geometry such as nanotubes. Using explicit expr...

A method to increase the Signal—to—Noise Ratio (SNR) of speech codecs is presented. It has been applied to Adaptive Delta Modulation (ADM) according to Jayant's algorithm. Observations indicate that bit streams resulting from these coders and quantization errors are correlated to some extend. Based on this experience a Quantization Error Correction method (QEC) has been developed that improves ...