Fawzi, Hamza Fawzi, Omar Scalet, Samuel O.

We introduce a classical algorithm to approximate the free energy of local, translation-invariant, one-dimensional quantum systems in the thermodynamic limit of infinite chain size. While the ground state problem (i.e., the free energy at temperature $T = 0$) for these systems is expected to be computationally hard even for quantum computers, our a...

Peugeot, A Riechert, H Annabi, S Balembois, L Villiers, M Flurin, E Griesmar, J Arrighi, E Pillet, J.-D Bretheau, L
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We perform two-tone spectroscopy on quantum circuits, where high-frequency radiation is generated by a voltage-biased superconductor-normal-superconductor Josephson junction and detection is carried out by an ancillary microwave resonator. We implement this protocol on two different systems, a transmon qubit and a $\lambda/4$ resonator. We demonstr...

Bagarello, Fabio Gazeau, Jean-Pierre Trapani, Camillo

It is known that the momentum operator canonically conjugated to the position operator for a particle moving in some bounded interval of the line {(with Dirichlet boundary conditions) is not essentially self-adjoint}: it has a continuous set of self-adjoint extensions. We prove that essential self-adjointness can be recovered by symmetrically weigh...

Lacroix, Thibaut Le Dé, Brieuc Riva, Angela Dunnett, Angus J Chin, Alex W

The MPSDynamics.jl package provides an easy to use interface for performing open quantum systems simulations at zero and finite temperatures. The package has been developed with the aim of studying non-Markovian open system dynamics using the state-of-the-art numerically exact Thermalized-Time Evolving Density operator with Orthonormal Polynomials ...

Lebon, Alexandre Calvez, B. Torres, M.B. Gallego, L.J. Vega, A.

By combining density-functional theory and a quantum-thermodynamic model, we compute the usable hydrogen storage capacities of slit pores formed by two Li-decorated layers of the strongly anisotropic Pmmn8 borophene sheet. Our results show the important role played by the rotational degree of freedom of the hydrogen molecule in determining the conf...

Catto, Isabelle Meng, Long Paturel, Eric Séré, Eric

Whereas many different models exist in the mathematical and physics literature for ground states of non-relativistic crystals, the relativistic case has been much less studied and we are not aware of any mathematical result on a fully relativistic treatment of crystals. In this paper, we introduce a mean-field relativistic energy for crystals in te...

Chowdhury, Rituparno Murto, Petri Panjwani, Naitik A Sun, Yan Ghosh, Pratyush Boeije, Yorrick Derkach, Vadim Woo, Seung-Je Millington, Oliver Congrave, Daniel G
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Optical control and read-out of the ground state spin structure has been demonstrated for defect states in crystalline semiconductors, including the diamond NV- center, and these are promising systems for quantum technologies. Molecular organic semiconductors offer synthetic control of spin placement, in contrast to current limitations in these cry...

Mothe, Raphaël Branciard, Cyril

The quantum switch, the canonical example of a process with indefinite causal order, has been claimed to provide various advantages over processes with definite causal orders for some particular tasks in the field of quantum metrology. In this work, we argue that some of these advantages in fact do not hold if a fairer comparison is made. To this e...

Duca, Alessandro Pozzoli, Eugenio

We address the small-time controllability problem for a nonlinear Schröodinger equation (NLS) on $\mathbb R^N$ in the presence of magnetic and electric external fields. We choose a particular framework where the equation becomes $i\partial_t \psi = [-\Delta+u_0(t)h_{\vec{0}}+\langle u(t), P\rangle +\kappa|\psi|^{2p}]\psi$. Here, the control operato...

Deville, Alain Deville, Yannick

Since a 1932 work from von Neumann, it is generally considered that if two statistical mixtures are represented by the same density operator {̊h̊o̊}̊, they should in fact be considered as the same mixture. In a 1970 paper, Zeh, considering this result to be a consequence of what he called the measurement axiom, introduced a thought experiment with ...