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A Divide-and-Conquer Approach to Dicke State Preparation [PDF]
IEEE Transactions on Quantum Engineering, 2022 We present a divide-and-conquer approach to deterministically prepare Dicke states $|D^{n}_{k}\rangle$ (i.e., equal-weight superpositions of all $n$-qubit states with Hamming weight $k$) on quantum computers. In an experimental evaluation for up to $n=6$
Shamminuj Aktar +3 more
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Superradiance and Broadband Emission Driving Fast Electron Dephasing in Open Quantum Systems [PDF]
Advanced ScienceThe physical origin of the ultrashort dephasing time T2 (≈ O(1) fs), persistently addressed in the solid‐state high‐harmonic generation (HHG), remains an unresolved and challenging issue because the electron scattering at such a short timescale within ...
Gimin Bae, Youngjae Kim, Jae Dong Lee
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Multiclass portfolio optimization via variational quantum Eigensolver with Dicke state ansatz [PDF]
Scientific ReportsCombinatorial optimization is a fundamental challenge in various domains, with portfolio optimization standing out as a key application in finance.
J. V. S. Scursulim +3 more
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Robustness of Entanglement for Dicke-W and Greenberger-Horne-Zeilinger Mixed States [PDF]
EntropyQuantum entanglement is a fundamental characteristic of quantum mechanics, and understanding the robustness of entanglement across different mixed states is crucial for comprehending the entanglement properties of general quantum states.
Ling-Hui Zhu +4 more
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Dicke State Quantum Search for Solving the Vertex Cover Problem
MathematicsThis paper proposes a quantum algorithm, named Dicke state quantum search (DSQS), to set qubits in the Dicke state |Dkn⟩ of D states in superposition to locate the target inputs or solutions of specific patterns among 2n unstructured input instances ...
Jehn-Ruey Jiang
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Berry Phase of Two Impurity Qubits as a Signature of Dicke Quantum Phase Transition
Photonics, 2022 In this paper, we investigate the effect of the Dicke quantum phase transition on the Berry phase of the two impurity qubits. The two impurity qubits only have dispersive interactions with the optical field of the Dicke quantum system. Therefore, the two
Wangjun Lu +5 more
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Wigner negativity in spin-j systems
Physical Review Research, 2021 The nonclassicality of simple spin systems as measured by Wigner negativity is studied on a spherical phase space. Several SU(2)-covariant states with common qubit representations are analyzed: spin coherent states, spin cat (Greenberger-Horne-Zeilinger ...
Jack Davis +3 more
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Critical behavior of quantum Fisher information in finite-size open Dicke model
AIP Advances, 2022 We explore the steady-state critical behavior of the finite-size open Dicke model—a model that incorporates spontaneous emission decay of the collective atomic spin states and decay of the cavity field. From the perspective of quantum information theory,
Meng Yu +3 more
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Lasing and counter-lasing phase transitions in a cavity-QED system
Physical Review Research, 2022 We study the effect of spontaneous emission and incoherent atomic pumping on the nonlinear semiclassical dynamics of the unbalanced Dicke model—a generalization of the Dicke model that features independent coupling strengths for the co- and counter ...
Kevin C. Stitely +3 more
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Floquet engineering of non-equilibrium superradiance
SciPost Physics, 2023 We demonstrate the emergence of a non-equilibrium superradiant phase in the dissipative Rabi-Dicke model. This phase is characterized by a photonic steady state that oscillates with a frequency close to the cavity frequency, in contrast to the constant ...
Lukas Broers, Ludwig Mathey
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