Fast macroscopic-superposition-state generation by coherent driving

Abstract

We propose a scheme to generate macroscopic superposition states in spin ensembles, where a coherent driving field is applied to accelerate the generation of macroscopic superposition states. The numerical calculation demonstrates that this approach allows us to generate a superposition of two classically distinct states of the spin ensemble with a high fidelity above 0.96 for 300 spins. For the larger spin ensemble, though the fidelity slightly decline, it maintains above 0.85 for an ensemble of 500 spins. The time to generate a macroscopic superposition state is also numerically calculated, which shows that the significantly shortened generation time allows us to achieve such macroscopic superposition states within a typical coherence time of the system.

17 pages, 15 figures

References in corpus (17)

• 14-qubit entanglement: creation and coherence
• Nonlinear atom interferometer surpasses classical precision limit
• Quantum Optical Metrology -- The Lowdown on High-N00N States
• Squeezing and entanglement in a Bose-Einstein condensate
• Quantum spin dynamics and entanglement generation with hundreds of trapped ions
• Towards fault-tolerant quantum computing with trapped ions
• Fisher Information and entanglement of non-Gaussian spin states
• Phonon-induced spin-spin interactions in diamond nanostructures: application to spin squeezing
• Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states
• A strict experimental test of macroscopic realism in a superconducting flux qubit
• Spin squeezing in a bimodal condensate: spatial dynamics and particle losses
• Unconditional quantum-noise suppression via measurement-based quantum feedback
• Proposal for the Creation and Optical Detection of Spin Cat States in Bose-Einstein Condensates
• A hybrid-systems approach to spin squeezing using a highly dissipative ancillary system
• Generation of macroscopic quantum-superposition states by linear coupling to a bath
• Conditional generation of path-entangled optical NOON states
• Fractional Revivals, Multiple-Cat States and Quantum Carpets in the Interaction of a Qubit with $N$ Qubits

Cited by in corpus (5)

• Superadiabatic generation of cat states in bosonic Josephson junctions under particle losses
• Quantum metrology based on symmetry-protected adiabatic transformation: Imperfection, finite time duration, and dephasing
• Multimode N00N states in driven atomtronic circuits
• Suppressing nonadiabatic transitions during adiabatic generation of highly entangled states in bosonic Josephson junctions
• Robust phase estimation of the ground-state energy without controlled time evolution on a quantum device