Useful Entanglement: How To Witness Quantum Measurement

For quantum physicists working on future systems, entangling quantum systems is a key resource for upcoming quantum computers and simulators. Physicists have crafted a new, reliable method to verify entanglement in the laboratory using a minimal number of assumptions about the system and measuring devices - it witnesses the presence of useful entanglement, a ‘verification without knowledge’.Quantum computation, quantum communication and quantum cryptography often require entanglement. For many of these upcoming quantum technologies, entanglement – this hard to grasp, counter-intuitive aspect in the quantum world – is a key ingredient. Therefore, experimental physicists often need to verify entanglement in their systems. read more

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