Entanglement Complexity: Measuring How Tangled
How entanglement is quantified: entanglement entropy, witnesses and other measures, plus experiments, swapping, teleportation and networks.
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Tagged: Quantum Teleportation
65 articles
The BB84 Protocol: The First QKD Scheme
BB84, proposed by Bennett and Brassard in 1984, was the first QKD protocol. How it encodes bits in photons and detects eavesdropping.
Quantum Interactive Proofs: Power and Protocols
Quantum interactive proofs let a verifier check a prover by exchanging quantum messages. The roles, security and the result QIP equals PSPACE.
Quantum Non-Local Games and What They Prove
Non-local games such as CHSH and the magic square game show that entangled players can beat classical ones. What they prove and how they are used.
Quantum Channel Theory: Modelling Noise Properly
Quantum channels describe how noise acts on quantum states. Types of channels, error correction, capacity, teleportation and simulation.
The Kochen-Specker Theorem and Contextuality
The Kochen-Specker theorem shows that quantum outcomes cannot all be fixed in advance independent of context. Proofs, experiments and meaning.
Quantum Interference: The Engine of Every Speedup
Quantum interference lets amplitudes add or cancel. Why it drives every quantum speedup, with examples from experiments and algorithms.
Quantum Finite Automata and Their Power
Quantum finite automata are the simplest quantum computing models. How they compare with classical automata and which languages they recognize.
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.
Quantum Optomechanics: Light Moving Mirrors
Quantum optomechanics couples light to mechanical motion. Radiation pressure, ground-state cooling, squeezing and uses in sensing.
Quantum Networking: Links, Nodes and Repeaters
How quantum networks link nodes with entanglement and repeaters, how QKD and teleportation work over them, and why no signal beats light.
