Quantum-enhanced measurements without entanglement
Quantum-enhanced measurements exploit quantum mechanical effects for increasing the
sensitivity of measurements of certain physical parameters and have great potential for both …
sensitivity of measurements of certain physical parameters and have great potential for both …
[HTML][HTML] Path-entangled photon sources on nonlinear chips
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 …
quantum mechanics. Utilizing optical nonlinearity for the generation of entangled photons …
Query-optimal estimation of unitary channels in diamond distance
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 …
unknown unitary channel acting on a d-dimensional qudit, we aim to output a classical …
Experimental quantum compressed sensing for a seven-qubit system
Well-controlled quantum devices with their increasing system size face a new roadblock
hindering further development of quantum technologies. The effort of quantum tomography …
hindering further development of quantum technologies. The effort of quantum tomography …
Reversing unknown qubit-unitary operation, deterministically and exactly
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 …
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
We perform quantum process tomography (QPT) for both discrete-and continuous-variable
quantum systems by learning a process representation using Kraus operators. The Kraus …
quantum systems by learning a process representation using Kraus operators. The Kraus …
Multi-core fiber integrated multi-port beam splitters for quantum information processing
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 …
tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such …
Robust and efficient Hamiltonian learning
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 …
quantum systems increase drastically. In order to have better control and understanding of …
Recovering quantum gates from few average gate fidelities
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 …
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
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 …
unitary, is an important primitive for quantum computing that can be used as a subroutine to …