Entanglement in a 20-Qubit Superconducting Quantum Computer

Entanglement in a 20-Qubit Superconducting Quantum Computer

The ability to prepare sizeable multi-qubit entangled states with full qubit control is a critical milestone for physical platforms upon which quantum computers are built. We investigate the extent to which entanglement is found within a prepared graph state on the 20-qubit superconducting quantum computer IBM Q Poughkeepsie. We prepared a graph state along a path consisting of all twenty qubits within the device and performed full quantum state…

Majorana Qubits: Entanglement Witness Distinguishes Robust Topological Quantum Information Encoding.

Researchers demonstrate a parity-measurement protocol to reliably identify Majorana zero modes, non-Abelian quasiparticles with potential as topological qubits, achieving an 18% detection probability in simulated six-site systems and exhibiting resilience to environmental noise despite sensitivity to quasiparticle contamination.