Variational Quantum Eigensolvers and contextuality


Love, P. (2019). Variational Quantum Eigensolvers and contextuality. Perimeter Institute. https://pirsa.org/19110121


Love, Peter. Variational Quantum Eigensolvers and contextuality. Perimeter Institute, Nov. 26, 2019, https://pirsa.org/19110121


          @misc{ pirsa_PIRSA:19110121,
            doi = {10.48660/19110121},
            url = {https://pirsa.org/19110121},
            author = {Love, Peter},
            keywords = {Quantum Information},
            language = {en},
            title = {Variational Quantum Eigensolvers and contextuality},
            publisher = {Perimeter Institute},
            year = {2019},
            month = {nov},
            note = {PIRSA:19110121 see, \url{https://pirsa.org}}

Peter Love Tufts University


The variational quantum eigensolver (VQE) is the leading candidate for practical applications of Noisy Intermediate Scale Quantum (NISQ) devices. The method has been widely implemented on small NISQ machines in both superconducting and ion trap implementations. I will review progress to date and discuss two questions . Firstly, how quantum mechanical are small VQE demonstrations? We will analyze this question using strong measurement contextuality. Secondly, can VQE be implemented at the scale of devices capable of exhibiting quantum supremacy, around 50 qubits? I will discuss some recent techniques to reduce the number of measurements required, which again use the concept of contextuality.