arXiv subjects

Sergey Filippov

Publications and source records attributed to Sergey Filippov.

4 recordsLinked to original sources

arXiv2023

Superior resilience of non-Gaussian entanglement against local Gaussian noises

Entanglement distribution task encounters a problem of how the initial entangled state should be prepared in order to remain entangled the longest possible time when subjected to local noises. In the realm of continuous-variable states and local Gaussian channels it is tempting to assume that the optimal initial state with the most robust entanglement is Gaussian too; however, this is not the case. Here we prove that specific non-Gaussian two-mode states remain entangled under the effect of deterministic local attenuation or amplification (Gaussian channels with the attenuation factor/power gain $κ_i$ and the noise parameter $μ_i$ for modes $i=1,2$) whenever $κ_1 μ_2^2 + κ_2 μ_1^2 < \frac{1}{4}(κ_1 + κ_2) (1 + κ_1 κ_2)$, which is a strictly larger area of parameters as compared to where Gaussian entanglement is able to tolerate noise. These results shift the ``Gaussian world'' paradigm in quantum information science (within which solutions to optimization problems involving Gaussian channels are supposed to be attained at Gaussian states).

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arXiv2022

Matrix product channel: Variationally optimized quantum tensor network to mitigate noise and reduce errors for the variational quantum eigensolver

Quantum processing units boost entanglement at the level of hardware and enable physical simulations of highly correlated electron states in molecules and intermolecular chemical bonds. The variational quantum eigensolver provides a hardware-efficient toolbox for ground state simulation; however, with limitations in precision. Even in the absence of noise, the algorithm may result into a biased energy estimation, particularly with some shallower ansatz types. Noise additionally degrades entanglement and hinders the ground state energy estimation (especially if the noise is not fully characterized). Here we develop a method to exploit the quantum-classical interface provided by informationally complete measurements to use classical software on top of the hardware entanglement booster for ansatz- and noise-related error reduction. We use the tensor network representation of a quantum channel that drives the noisy state toward the ground one. The tensor network is a completely positive map by construction, but we elaborate on making the trace preservation condition local so as to activate the sweeping variational optimization. This method brings into reach energies below the noiseless ansatz by creating additional correlations among the qubits and denoising them. Analyzing the example of the stretched water molecule with a tangible entanglement, we argue that a hybrid strategy of using the quantum hardware together with the classical software outperforms a purely classical strategy provided the classical parts have the same bond dimension. The proposed optimization algorithm extends the variety of noise mitigation methods and facilitates the more accurate study of the energy landscape for deformed molecules. The algorithm can be applied as the final postprocessing step in the quantum hardware simulation of protein-ligand complexes in the context of drug design.

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arXiv2017

A necessary condition for incompatibility of observables in general probabilistic theories

We quantify the intrinsic noise content of an observable in a general probabilistic theory and derive a noise content inequality for incompatible observables. We apply the derived inequality to standard quantum theory, the quantum theory of processes, and polytope state spaces. The noise content for positive operator-valued measures takes a particularly simple form and equals the sum of minimal eigenvalues of all the effects. We illustrate our findings with a number of examples including the introduced notion of reverse observables.

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arXiv2016

Tensor power of dynamical maps and P- vs. CP-divisibility

The are several non-equivalent notions of Markovian quantum evolution. In this paper we show that the one based on the so-called CP-divisibility of the corresponding dynamical map enjoys the following stability property: the dynamical map $Λ_t$ is CP-divisible iff the second tensor power $Λ_t\otimesΛ_t$ is CP-divisible as well. Moreover, the P-divisibility of the map $Λ_t\otimesΛ_t$ is equivalent to the CP-divisibility of the map $Λ_t$. Interestingly, the latter property is no longer true if we replace the P-divisibility of $Λ_t\otimesΛ_t$ by simple positivity and the CP-divisibility of $Λ_t$ by complete positivity. That is, unlike when $Λ_t$ has a time-independent generator, positivity of $Λ_t\otimesΛ_t$ does not imply complete positivity of $Λ_t$.

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