Phonon Number Measurement Using Optimal Composite Pulses
arXiv:2405.17736 · doi:10.1364/OE.537501
Abstract
Measuring the phonon number of the laser-cooled ions is an indispensable step in evaluating whether an ion is in ground state. At present, commonly used methods in the experiments are red-to-blue sideband ratios and adiabatic evolution red-sideband methods. We theoretically propose a method using composite pulses which does not need a fit of state evolution and can directly measure the population of the selected Fock state. It can measure higher Fock state population more directly comparing with the adiabatic evolution red-sideband method. We use quantum optimal control method to improve the fidelity of unitary operation of the composite pulses. With quantum optimal control technology, we can discuss the situation where the laser strength is strong, and many approximations will not be necessary, where the gate fidelity can be further improved. Then we give a method to modify the measurement result for a higher accuracy which has a good performance, and we give an example to illustrate its application on high Fock state measurement.
References in corpus (16)
- Probing entanglement entropy via randomized measurements
- Demonstration of the trapped-ion quantum-CCD computer architecture
- Experimental Test of Quantum Jarzynski Equality with a Trapped Ion System
- Single ion-qubit exceeding one hour coherence time
- Optimal metrology with programmable quantum sensors
- Cross-Platform Verification of Intermediate Scale Quantum Devices
- Scalable global entangling gates on arbitrary ion qubits
- Quantum-enhanced sensing of a mechanical oscillator
- Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling
- Observing emergent hydrodynamics in a long-range quantum magnet
- Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions
- State Readout of a Trapped Ion Qubit Using a Trap-Integrated Superconducting Photon Detector
- Realization of near-deterministic arithmetic operations and quantum state engineering
- Composite pulses for high-fidelity population inversion in optically dense, inhomogeneously broadened atomic ensembles
- Modular Quantum Computation in a Trapped Ion System
- Phonon-number-resolving Detection of Multiple Local Phonon Modes in Trapped Ions