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8 months ago in Quantum Computing By Pavitra

Is Quantum Computing Truly Efficient?

Is quantum computing genuinely efficient when dealing with high-dimensional problems, and what limits its practical advantage?

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By Daniel Answered 3 months ago

Quantum computers are theoretically powerful for processing high-dimensional information, since a system of n qubits can represent 2n2^n2n states simultaneously. However, the main bottleneck lies in measurement and readout. Extracting a specific, useful outcome from this large probabilistic quantum state—often referred to as state tomography—is generally classically intractable. Practical efficiency therefore depends on designing quantum algorithms that amplify the desired solution so it can be measured with high probability, without needing to fully reconstruct the entire quantum state.

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