An Introduction to Quantum Computing
An Introduction to Quantum Computing ____________________________________________________________________________________ them carefully, to ensure that the final required physical quantities can be stably reproduced from the statistical distribution of measurement results. The larger technical and theoretical barriers may not lie in building a physical system with an extremely large state space. The challenge is to maintain effective control over this high-dimensional state space with extremely high precision. The core goal is to protect inherently fragile physical effects such as quantum interference and quantum entanglement, so that they can meet the requirements needed to achieve real, usable, and implementable quantum computational advantage. Quantum Entanglement Quantum entanglement is the phenomenon in which the quantum state of each particle in a group cannot be described independently of the state of the others, even when the particles are separated by a large distance. The topic of quantum entanglement is at the heart of the disparity between classical physics and quantum physics. These entangled particles must be described as a single unified whole. It is not only a unique core feature of modern quantum mechanics, but also a key computational resource that quantum algorithms can leverage. For example, the mathematically expressed standard form of a maximally entangled two-qubit state: |Φ + ⟩ = |00⟩ +|11⟩ √2 When both qubits are measured in the computational basis, the outcomes 00 and 11 each occur with a probability of 50% in the ideal case. The individual outcomes are random, but their correlation reflects the entangled nature of the joint quantum state.
Figure 6. A Hadamard gate followed by CNOT creates a standard entangled Bell pair.
_______________________________________________________________________________________________ SCTE Technical Committee : Dave Hodges and Dr Anthony Basham. © 2026 Society for Broadband Professionals. All rights reserved Page 10 These two entangled qubits under the standard computational basis if measured, we can observe from the results that the two qubits are tightly bound by an inherent correlation: this quantum system will only produce the two paired outcomes 00 or 11. In an ideal theoretical scenario, each outcome has a 50% probability of occurring, and the mismatched cross-outcomes 01 or 10 will never appear. The measurement result of a single qubit is objectively random and completely unpredictable on its own, but the correlation between the two final outcomes is highly ordered and fully correlated.
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