Estimating a quantum state of a quantum mechanical system

This invention describes a method to determine the precise state of a quantum system. It works by repeatedly taking simple, two-outcome measurements on individual quantum bits (qubits) within the system. The probabilities from these measurements are then fed into a specific mathematical formula to reconstruct the quantum system's overall state.

Why it matters: In 2009, quantum computers capable of reliably performing the necessary single-qubit measurements were largely theoretical. Today, significant advancements in quantum hardware and control systems make the practical application of this efficient state estimation method much more viable.

Status: ExpiredProtection ended and was never renewed
How hard to build: SpecializedQuantum computer and algorithm implementation

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