External-level assisted cooling by measurement
arXiv:2106.07923 · doi:10.1103/PhysRevA.104.063105
Abstract
A quantum resonator in a thermal-equilibrium state with a high temperature has a large average population and is featured with significant occupation over Fock states with a high excitation number. The resonator could be cooled down via continuous measurements on the ground state of a coupled two-level system (qubit). We find, however, that the measurement-induced cooling might become inefficient in the high-temperature regime. Beyond the conventional strategy, we introduce strong driving between the excited state of the qubit and an external level. It can remarkably broaden the cooling range in regard to the non-vanishing populated Fock states of the resonator. Without any precooling procedure, our strategy allows a significant reduction of the populations over Fock states with a high excitation number, giving rise to nondeterministic ground-state cooling after a sequence of measurements. The driving-induced fast transition constrains the resonator and the ancillary qubit at their ground state upon measurement and then simulates the quantum Zeno effect. Our protocol is applied to cool down a high-temperature magnetic resonator. Additionally, it is generalized to a hybrid cooling protocol by interpolating the methods with and without strong driving, which can accelerate the cooling process and increase the overlap between the final state of the resonator and its ground state.
References in corpus (14)
- Strongly coupled magnons and cavity microwave photons
- Quantum Theory of Cavity-Assisted Sideband Cooling of Mechanical Motion
- Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
- Theory of ground state cooling of a mechanical oscillator using dynamical back-action
- Motional Quantum Ground State of a Levitated Nanoparticle from Room Temperature
- Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems
- Magnon Polarons in the Spin Seebeck Effect
- Thermodynamical Control by Frequent Quantum Measurements
- Establishing EPR-channels between Nanomechanics and Atomic Ensembles
- Coherent elastic excitation of spin waves
- Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing
- Long-range entanglement generation via frequent measurements
- Comparing resolved-sideband cooling and measurement-based feedback cooling on an equal footing: analytical results in the regime of ground-state cooling
- Spatial compression of a particle state in a parabolic potential by spin measurements
Cited by in corpus (11)
- Chiral current in Floquet cavity-magnonics
- Breaking the limits of purification: Postselection enhances heat-bath algorithmic cooling
- Generating Fock-state superpositions from coherent states by selective measurement
- Refrigeration via purification through repeated measurements
- Generic eigenstate preparation via measurement-based purification
- Measurement-induced nuclear spin polarization
- Generating magnon Bell states via parity measurement
- Optimizing measurement-based cooling by reinforcement learning
- Efficient nonclassical state preparation via generalized parity measurement
- Reducing thermal noises by quantum refrigerators
- Simultaneous cooling by measuring one ancillary system