Results 11 to 20 of about 1,553 (138)
Universal gates for transforming multipartite entangled Dicke states
New Journal of Physics, 2014 We determine the minimal number of qubits that it is necessary to have access to in order to transform Dicke states into other Dicke states. In general, the number of qubits in Dicke states cannot be increased via transformation gates by accessing only a
Toshiki Kobayashi +6 more
doaj +1 more source
Quantum metrology with Dicke squeezed states
New Journal of Physics, 2014 We introduce a new class of quantum many-particle entangled states, called the Dicke squeezed (or DS) states, which can be used to improve the precision in quantum metrology beyond the standard quantum limit.
Z Zhang, L M Duan
doaj +1 more source
Asymmetry activation and its relation to coherence under permutation operation [PDF]
QuantumA Dicke state and its decohered state are invariant for permutation. However, when another qubits state to each of them is attached, the whole state is not invariant for permutation, and has a certain asymmetry for permutation.
Masahito Hayashi
doaj +1 more source
Generation of Schrödinger Cat States in a Hybrid Cavity Optomechanical System
Entropy, 2022 We present an alternative scheme to achieve Schrödinger cat states in a strong coupling hybrid cavity optomechanical system. Under the single-photon strong-coupling regime, the interaction between the atom–cavity–oscillator system can induce the ...
Xingwei An +4 more
doaj +1 more source
Detecting metrologically useful entanglement in the vicinity of Dicke states
New Journal of Physics, 2015 We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measurement of the sensitivity.
Iagoba Apellaniz +4 more
doaj +1 more source
Dicke subsystems are entangled [PDF]
QuantumWe show that all reduced states of nonproduct symmetric Dicke states of arbitrary number of qudits are genuinely multipartite entangled, and of nonpositive partial transpose with respect to any subsystem.
Szilárd Szalay, Péter Nyári
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
A Divide-and-Conquer Approach to Dicke State Preparation
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
doaj +1 more source
Critical behaviour in the optimal generation of multipartite entanglement
Scientific Reports, 2017 Two systems whose correlations cannot be classically accounted for display the simplest instance of quantum entanglement. Although this two-party association has caused a revolution in the foundations and uses of quantum mechanics, genuine entanglement ...
M. G. M. Moreno, Fernando Parisio
doaj +1 more source