Quantum fidelity measures for mixed states
Applications of quantum technology often require fidelities to quantify performance. These
provide a fundamental yardstick for the comparison of two quantum states. While this is …
provide a fundamental yardstick for the comparison of two quantum states. While this is …
[HTML][HTML] Variational quantum fidelity estimation
Computing quantum state fidelity will be important to verify and characterize states prepared
on a quantum computer. In this work, we propose novel lower and upper bounds for the …
on a quantum computer. In this work, we propose novel lower and upper bounds for the …
[HTML][HTML] Quantum coherence sets the quantum speed limit for mixed states
We cast observable measure of quantum coherence as a resource to control the quantum
speed limit (QSL) for unitary evolutions. For non-unitary evolutions, QSL depends on that of …
speed limit (QSL) for unitary evolutions. For non-unitary evolutions, QSL depends on that of …
Statistical mixtures of states can be more quantum than their superpositions: Comparison of nonclassicality measures for single-qubit states
A bosonic state is commonly considered nonclassical (or quantum) if its Glauber-Sudarshan
P function is not a classical probability density, which implies that only coherent states and …
P function is not a classical probability density, which implies that only coherent states and …
Variational approach to the quantum separability problem
We present the variational separability verifier (VSV), which is a variational quantum
algorithm that determines the closest separable state (CSS) of an arbitrary quantum state …
algorithm that determines the closest separable state (CSS) of an arbitrary quantum state …
Optimal measurements for quantum fidelity between Gaussian states and its relevance to quantum metrology
Quantum fidelity is a measure to quantify the closeness between two quantum states. In an
operational sense, it is defined as the minimal overlap between the probability distributions …
operational sense, it is defined as the minimal overlap between the probability distributions …
Bell nonlocality and fully entangled fraction measured in an entanglement-swap** device without quantum state tomography
We propose and experimentally implement an efficient procedure based on entanglement
swap** to determine the Bell nonlocality measure of Horodecki et al.[Phys. Lett. A 200 …
swap** to determine the Bell nonlocality measure of Horodecki et al.[Phys. Lett. A 200 …
Experimental measurement of the Hilbert-Schmidt distance between two-qubit states as a means for reducing the complexity of machine learning
V Trávníček, K Bartkiewicz, A Černoch, K Lemr - Physical review letters, 2019 - APS
We report on the experimental measurement of the Hilbert-Schmidt distance between two
two-qubit states by many-particle interference. We demonstrate that our three-step method …
two-qubit states by many-particle interference. We demonstrate that our three-step method …
Method for universal detection of two-photon polarization entanglement
Detecting and quantifying quantum entanglement of a given unknown state poses problems
that are fundamentally important for quantum information processing. Surprisingly, no direct …
that are fundamentally important for quantum information processing. Surprisingly, no direct …
Quantifying entanglement of a two-qubit system via measurable and invariant moments of its partially transposed density matrix
We describe a direct method to determine the negativity of an arbitrary two-qubit state in
experiments. The method is derived by analyzing the relation between the purity, negativity …
experiments. The method is derived by analyzing the relation between the purity, negativity …