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Qubits

The fundamental unit of information in quantum-computing, representing a state in a superposition of $|0⟩$ and $|1⟩$. Unlike classical bits, qubits leverage quantum-mechanics to perform parallel computations through complex state spaces.

Core Principles

• Superposition: The ability of a qubit to exist in multiple states simultaneously until measured.
• Entanglement: A phenomenon where qubits become correlated such that the state of one cannot be described independently of the others.
• Decoherence: The loss of quantum information due to interaction with the external environment, a primary obstacle to stable computation.

Advanced Architectures & Scaling

• Topological Quantum Computing: An approach utilizing Majorana Fermions to create qubits that are inherently protected from local noise and decoherence by their topological properties.
• Microsoft Majorana 2 Chip:
  • Unveiled in July 2026, claiming significant advances toward scalable topological quantum computing.
  • Projected roadmap targets the first scalable topological quantum computer by 2029.
  • Claims face skepticism regarding the unproven nature of topological qubit stability and previous experimental validations.
  • See detailed critique: Microsoft’s Majorana 2 Quantum Chip: Unproven Topological Qubit Claims and Skepticism

References

• Microsoft’s Majorana 2 Quantum Chip: Unproven Topological Qubit Claims and Skepticism