Quantum Coherent Computing and Coherence Budgets
Quantum coherent computing relies on keeping qubits coherent long enough to finish a computation. How coherence limits algorithms and applications.
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Quantum Hardware & Qubits
Superconducting circuits, trapped ions, photonics, silicon spins and neutral atoms: the physical machines behind the qubit count, and what limits them.
69 articles
Quantum Spin Networks: Graphs of Quantum Geometry
Spin networks are graphs labeled by spins. They appear in quantum gravity and in quantum information. Properties, uses and experimental work.
Quantum Computational Networks and Their Models
Models of quantum computational networks: how processors and links are combined, and uses in cryptography, optimization and cloud computing.
QRAM: Quantum Random Access Memory, Explained
Quantum random access memory would let algorithms query data in superposition. How QRAM would work, why it is hard to build and why it matters.
The Quantum Circuit Model: The Standard Picture
The quantum circuit model describes computation as qubits passing through gates and ending in measurement. Design, complexity and simulation.
Majorana Qubits: Topological Protection in Hardware
Majorana qubits would store information non-locally in pairs of Majorana zero modes. Their structure, braiding, and the state of the evidence.
Rydberg Atom Qubits and Their Strong Interactions
Rydberg atoms have highly excited electrons that interact strongly over micrometers. How this enables fast two-qubit gates in atom arrays.
Bosonic Qubits: Encoding in an Oscillator
Bosonic qubits store information in the many levels of an oscillator, such as a microwave cavity. Their principles, coherence and scalability.
Hybrid Quantum Systems: Joining Different Platforms
Hybrid quantum systems combine platforms, such as superconducting qubits with spins or photons, to use each one’s strengths. Types and challenges.
Surface Acoustic Wave Qubits and Phonon Coupling
Surface acoustic wave devices can carry quantum information as phonons between qubits. How SAW qubits and couplings work, and their prospects.
Neutral Atom Quantum Computing: How It Scales
Neutral atom quantum computers hold atoms in optical tweezers and entangle them via Rydberg states. How they work and why they scale well.
Donor-Based Quantum Computing in Silicon
Donor-based quantum computing uses single phosphorus or other donor atoms in silicon as qubits. How they are placed, controlled and scaled.
