Quantum-enhanced measurements without entanglement

D Braun, G Adesso, F Benatti, R Floreanini… - Reviews of Modern …, 2018 - APS
Quantum-enhanced measurements exploit quantum mechanical effects for increasing the
sensitivity of measurements of certain physical parameters and have great potential for both …

[HTML][HTML] Path-entangled photon sources on nonlinear chips

AS Solntsev, AA Sukhorukov - Reviews in Physics, 2017 - Elsevier
Photon entanglement has a range of applications from secure communication to the tests of
quantum mechanics. Utilizing optical nonlinearity for the generation of entangled photons …

Query-optimal estimation of unitary channels in diamond distance

J Haah, R Kothari, R O'Donnell… - 2023 IEEE 64th Annual …, 2023 - ieeexplore.ieee.org
We consider process tomography for unitary quantum channels. Given access to an
unknown unitary channel acting on a d-dimensional qudit, we aim to output a classical …

Experimental quantum compressed sensing for a seven-qubit system

CA Riofrio, D Gross, ST Flammia, T Monz… - Nature …, 2017 - nature.com
Well-controlled quantum devices with their increasing system size face a new roadblock
hindering further development of quantum technologies. The effort of quantum tomography …

Reversing unknown qubit-unitary operation, deterministically and exactly

S Yoshida, A Soeda, M Murao - Physical Review Letters, 2023 - APS
We report a deterministic and exact protocol to reverse any unknown qubit-unitary operation,
which simulates the time inversion of a closed qubit system. To avoid known no-go results …

Gradient-descent quantum process tomography by learning Kraus operators

S Ahmed, F Quijandría, AF Kockum - Physical Review Letters, 2023 - APS
We perform quantum process tomography (QPT) for both discrete-and continuous-variable
quantum systems by learning a process representation using Kraus operators. The Kraus …

Multi-core fiber integrated multi-port beam splitters for quantum information processing

J Cariñe, G Cañas, P Skrzypczyk, I Šupić, N Guerrero… - Optica, 2020 - opg.optica.org
Multi-port beam splitters are cornerstone devices for high-dimensional quantum information
tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such …

Robust and efficient Hamiltonian learning

W Yu, J Sun, Z Han, X Yuan - Quantum, 2023 - quantum-journal.org
With the fast development of quantum technology, the sizes of both digital and analog
quantum systems increase drastically. In order to have better control and understanding of …

Recovering quantum gates from few average gate fidelities

I Roth, R Kueng, S Kimmel, YK Liu, D Gross, J Eisert… - Physical review …, 2018 - APS
Characterizing quantum processes is a key task in the development of quantum
technologies, especially at the noisy intermediate scale of today's devices. One method for …

Universal compiling and (no-) free-lunch theorems for continuous-variable quantum learning

T Volkoff, Z Holmes, A Sornborger - PRX Quantum, 2021 - APS
Quantum compiling, where a parameterized quantum circuit is trained to learn a target
unitary, is an important primitive for quantum computing that can be used as a subroutine to …