Shadows of quantum machine learning

S Jerbi, C Gyurik, SC Marshall, R Molteni… - Nature …, 2024 - nature.com
Quantum machine learning is often highlighted as one of the most promising practical
applications for which quantum computers could provide a computational advantage …

Random unitaries in extremely low depth

T Schuster, J Haferkamp, HY Huang - arxiv preprint arxiv:2407.07754, 2024 - arxiv.org
We prove that random quantum circuits on any geometry, including a 1D line, can form
approximate unitary designs over $ n $ qubits in $\log n $ depth. In a similar manner, we …

Learning quantum states and unitaries of bounded gate complexity

H Zhao, L Lewis, I Kannan, Y Quek, HY Huang… - PRX Quantum, 2024 - APS
While quantum state tomography is notoriously hard, most states hold little interest to
practically minded tomographers. Given that states and unitaries appearing in nature are of …

Scalable and flexible classical shadow tomography with tensor networks

AA Akhtar, HY Hu, YZ You - Quantum, 2023 - quantum-journal.org
Classical shadow tomography is a powerful randomized measurement protocol for
predicting many properties of a quantum state with few measurements. Two classical …

Learning quantum processes and Hamiltonians via the Pauli transfer matrix

MC Caro - ACM Transactions on Quantum Computing, 2024 - dl.acm.org
Learning about physical systems from quantum-enhanced experiments can outperform
learning from experiments in which only classical memory and processing are available …

Quantum error mitigated classical shadows

H Jnane, J Steinberg, Z Cai, HC Nguyen, B Koczor - PRX Quantum, 2024 - APS
Classical shadows enable us to learn many properties of a quantum state ρ with very few
measurements. However, near-term and early fault-tolerant quantum computers will only be …

Operator relaxation and the optimal depth of classical shadows

M Ippoliti, Y Li, T Rakovszky, V Khemani - Physical Review Letters, 2023 - APS
Classical shadows are a powerful method for learning many properties of quantum states in
a sample-efficient manner, by making use of randomized measurements. Here we study the …

Learnability transitions in monitored quantum dynamics via eavesdropper's classical shadows

M Ippoliti, V Khemani - PRX Quantum, 2024 - APS
Monitored quantum dynamics—unitary evolution interspersed with measurements—has
recently emerged as a rich domain for phase structure in quantum many-body systems away …

Demonstration of robust and efficient quantum property learning with shallow shadows

HY Hu, A Gu, S Majumder, H Ren, Y Zhang… - arxiv preprint arxiv …, 2024 - arxiv.org
Extracting information efficiently from quantum systems is a major component of quantum
information processing tasks. Randomized measurements, or classical shadows, enable …

Training variational quantum circuits with CoVaR: Covariance root finding with classical shadows

G Boyd, B Koczor - Physical Review X, 2022 - APS
Exploiting near-term quantum computers and achieving practical value is a considerable
and exciting challenge. Most prominent candidates as variational algorithms typically aim to …