The randomized measurement toolbox
Programmable quantum simulators and quantum computers are opening unprecedented
opportunities for exploring and exploiting the properties of highly entangled complex …
opportunities for exploring and exploiting the properties of highly entangled complex …
Provably efficient machine learning for quantum many-body problems
Classical machine learning (ML) provides a potentially powerful approach to solving
challenging quantum many-body problems in physics and chemistry. However, the …
challenging quantum many-body problems in physics and chemistry. However, the …
Learning many-body Hamiltonians with Heisenberg-limited scaling
Learning a many-body Hamiltonian from its dynamics is a fundamental problem in physics.
In this Letter, we propose the first algorithm to achieve the Heisenberg limit for learning an …
In this Letter, we propose the first algorithm to achieve the Heisenberg limit for learning an …
Probing postmeasurement entanglement without postselection
SJ Garratt, E Altman - PRX Quantum, 2024 - APS
We study the problem of observing quantum collective phenomena emerging from large
numbers of measurements. These phenomena are difficult to observe in conventional …
numbers of measurements. These phenomena are difficult to observe in conventional …
Maximum Entropy Principle in Deep Thermalization and in Hilbert-Space Ergodicity
We report universal statistical properties displayed by ensembles of pure states that
naturally emerge in quantum many-body systems. Specifically, two classes of state …
naturally emerge in quantum many-body systems. Specifically, two classes of state …
Random unitaries in extremely low depth
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 …
approximate unitary designs over $ n $ qubits in $\log n $ depth. In a similar manner, we …
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 …
recently emerged as a rich domain for phase structure in quantum many-body systems away …
Preparing random states and benchmarking with many-body quantum chaos
Producing quantum states at random has become increasingly important in modern
quantum science, with applications being both theoretical and practical. In particular …
quantum science, with applications being both theoretical and practical. In particular …
Probing many-body quantum chaos with quantum simulators
The spectral form factor (SFF), characterizing statistics of energy eigenvalues, is a key
diagnostic of many-body quantum chaos. In addition, partial spectral form factors (PSFFs) …
diagnostic of many-body quantum chaos. In addition, partial spectral form factors (PSFFs) …
Exact emergent quantum state designs from quantum chaotic dynamics
We present exact results on a novel kind of emergent random matrix universality that
quantum many-body systems at infinite temperature can exhibit. Specifically, we consider an …
quantum many-body systems at infinite temperature can exhibit. Specifically, we consider an …