co9olguy
commented
3 years ago Thanks for the submission! We hope you have enjoyed participating in QHack :smiley:
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Team Name:
Quantum Legion
Project Description:
Variational methods have a wide range of application in optimization and machine learning. However, they can also be used to study quantum computers. Currently, we are in an era where quantum computers present a large amount of noise due to the low number of qubits (<100) and the low fidelity of the gates. In this era, known as the noisy intermediate-scale quantum (NISQ), characterizing how quantum devices work is critical. One way to achieve this is through quantum tomography. This consists of protocols that allow obtaining the quantum state of a physical system, which can be a prior unknown. In this work we will implement a variational tomographic method for pure quantum states, based on this paper of Christopher Ferrie. In every iteration of the protocol a "guess" state approaches the state of some system using the result of two measurements in the system.
Presentation:
A jupyter notebook
Source code:
https://github.com/lezav/variational_quantum_state_tomography