Quantum physics, cryptography, and SPAM tomography
Juul, Gabriel K.
May 9, 2018
The year is 2027.
Quantum machines are commonplace, powering advanced computers, communications systems, and engines of the world through phenomena like entanglement, superposition, and superradiance.
But like all machines, these quantum systems are susceptible to error. If gone undetected, such errors can corrupt the usefulness of our quantum systems, and even corrupt our trust in the machines themselves…
This document is all that stands between us and…
This thesis focuses on detecting correlated errors in quantum systems using loop state-preparation-and-measurement (SPAM) tomography. I discuss a two-qubit quantum system through the lens of quantum cryptography: an eavesdropper has introduced "correlated errors" into a quantum machine designed to distribute a secure encryption key between two parties. The errors have corrupted the machine and made it appear secure, when in fact it is not. I experimentally demonstrate that loop SPAM tomography can identify these errors using only measured data and minimal assumptions.
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