Harmonic mixing in two coupled qubits: quantum synchronization via ac drives
arXiv:1210.3534 · doi:10.1103/PhysRevA.86.065803
Abstract
Simulating a system of two driven coupled qubits, we show that the time-averaged probability to find one driven qubit in its ground or excited state can be controlled by an ac drive in the second qubit. Moreover, off-diagonal elements of the density matrix responsible for quantum coherence can also be controlled via driving the second qubit, i.e., quantum coherence can be enhanced by appropriate choice of the bi-harmonic signal. Such a dynamic synchronization of two differently driven qubits has an analogy with harmonic mixing of Brownian particles forced by two signals through a substrate. Nevertheless, the quantum synchronization in two qubits occurs due to multiplicative coupling of signals in the qubits rather than via a nonlinear harmonic mixing for a classical nano-particle.
5 pages, 3 figures
References in corpus (7)
- Atomic physics and quantum optics using superconducting circuits
- Quantum metamaterials: Electromagnetic waves in a Josephson qubit line
- Rectification of laser-induced electronic transport through molecules
- Indirect Quantum Tomography of Quadratic Hamiltonians
- Modelling chemical reactions using semiconductor quantum dots
- Two-qubit parametric amplifier: large amplification of weak signals
- Noise-spectroscopy of multiqubit systems: Determining all their parameters by applying an external classical noise
Cited by in corpus (5)
- Noise-Induced Transitions in Optomechanical Synchronization
- Dirac fermion time-Floquet crystal: manipulating Dirac points
- On the Impact of Neutron Star Binaries Natal-Kick Distribution on the Galactic r-process Enrichment
- Dissipative dynamics in a tunable Rabi dimer with periodic harmonic driving
- A Method to Detect Quantum Coherent Transport in Memristive Devices