Spin-motion entanglement and state diagnosis with squeezed oscillator wavepackets
arXiv:1412.7100 · doi:10.1038/nature14458
Abstract
Mesoscopic superpositions of distinguishable coherent states provide an analog to the Schrödinger's cat thought experiment. For mechanical oscillators these have primarily been realised using coherent wavepackets, for which the distinguishability arises due to the spatial separation of the superposed states. Here, we demonstrate superpositions composed of squeezed wavepackets, which we generate by applying an internal-state dependent force to a single trapped ion initialized in a squeezed vacuum state with 9 dB reduction in the quadrature variance. This allows us to characterise the initial squeezed wavepacket by monitoring the onset of spin-motion entanglement, and to verify the evolution of the number states of the oscillator as a function of the duration of the force. In both cases, we observe clear differences between displacements aligned with the squeezed and anti-squeezed axes. We observe coherent revivals when inverting the state-dependent force after separating the wavepackets by more than 19 times the ground-state root mean squared extent, which corresponds to 56 times the root mean squared extent of the squeezed wavepacket along the displacement direction. Aside from their fundamental nature, these states may be useful for quantum metrology or quantum information processing with continuous variables.
arXiv comment9 pages, 8 figures, including Methods section. Minor changes to the texts, figures and captions
References in corpus (12)
- Gaussian Quantum Information
- Encoding a qubit in an oscillator
- Enhancing the sensitivity of the LIGO gravitational wave detector by using squeezed states of light
- A gravitational wave observatory operating beyond the quantum shot-noise limit: Squeezed light in application
- Quantum simulation of the Dirac equation
- Quantum harmonic oscillator state synthesis by reservoir engineering
- Quantum Encodings in Spin Systems and Harmonic Oscillators
- Weak force detection with superposed coherent states
- Spin-dependent forces on trapped ions for phase-stable quantum gates and motional Schrodinger-cat states
- Entanglement-enhanced detection of single-photon scattering events
- Long-lived mesoscopic entanglement outside the Lamb-Dicke regime
- Quantum tomography in position and momentum space
Cited by in corpus (66)
- Encoding a qubit in a trapped-ion mechanical oscillator
- Experimentally simulating the dynamics of quantum light and matter at ultrastrong coupling
- Observation of a quantum phase transition in the quantum Rabi model with a single trapped ion
- Schrödinger cat states of a 16-microgram mechanical oscillator
- Quantum simulation of the quantum Rabi model in a trapped ion
- Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions
- Observation of quantum interference between separated mechanical oscillator wavepackets
- Steady-state coherences by composite system-bath interactions
- Entanglement and quantum superposition induced by a single photon
- Direct characteristic-function tomography of quantum states of the trapped-ion motional oscillator
- Quantum error correction using squeezed Schrödinger cat states
- Slowing Quantum Decoherence by Squeezing in Phase Space
- Fast quantum control and light-matter interactions at the 10,000 quanta level
- Sequential modular position and momentum measurements of a trapped ion mechanical oscillator
- Fast Generation of GHZ-like States Using Collective-Spin XYZ Model
- Dissipative stabilization of squeezing beyond 3 dB in a microwave mode
- Quantum error correction with dissipatively stabilized squeezed cat qubits
- Quantum computation and simulation with vibrational modes of trapped ions
- Tachyon physics with trapped ions
- Rapid Quantum Squeezing by Jumping the Harmonic Oscillator Frequency
- Experimental and theoretical investigation of a multi-mode cooling scheme using multiple EIT resonances
- Quantum oscillator noise spectroscopy via displaced cat states
- Continuous variables quantum computation over the vibrational modes of a single trapped ion
- Phase-stable free-space optical lattices for trapped ions
- Hybrid Oscillator-Qubit Quantum Processors: Instruction Set Architectures, Abstract Machine Models, and Applications
- Large array of Schrödinger cat states facilitated by an optical waveguide
- NOON state of Bose atoms in the double-well potential via an excited state quantum phase transition
- Towards Improved Quantum Simulations and Sensing with Trapped 2D Ion Crystals via Parametric Amplification
- Optimized Tomography of Continuous Variable Systems Using Excitation Counting
- Deterministic nonlinear phase gates induced by a single qubit
- Modular Quantum Computation in a Trapped Ion System
- Quantum time dilation in atomic spectra
- Squeezed Coherent States of Motion for Ions Confined in Quadrupole and Octupole Ion Traps
- Quantum metrology with a continuous-variable system
- Squeezed displaced entangled states in the quantum Rabi model
- Deterministic nonclassicality for quantum mechanical oscillators in thermal states
- Demonstrating efficient and robust bosonic state reconstruction via optimized excitation counting
- Resonant Schrödinger Cat States in Circuit Quantum Electrodynamics
- Fast quantum state preparation and bath dynamics using non-Gaussian variational ansatz and quantum optimal control
- Prospect for precision quantum logic spectroscopy of vibrational overtone transitions in molecular oxygen ions
- Spinor matterwave control with nanosecond spin-dependent kicks
- Spatial compression of a particle state in a parabolic potential by spin measurements
- Nanomechanical State Amplifier Based on Optical Inverted Pendulum
- Assisted metrology and preparation of macroscopic superpositions with split spin-squeezed states
- Open quantum dynamics with variational non-Gaussian states and the truncated Wigner approximation
- Quantum squeezing amplification with a weak Kerr nonlinear oscillator
- Thermally-induced qubit coherence in quantum electromechanics
- Optimal Phase-Insensitive Force Sensing with Non-Gaussian States
- Robust phase metrology with hybrid quantum interferometers against particle losses
- On the paradoxical evolution of the number of photons in a new model of interpolating Hamiltonians
- Pulsed multireservoir engineering for a trapped ion with applications to state synthesis and quantum Otto cycles
- Stabilization of cat-state manifolds using nonlinear reservoir engineering
- Unitary death of Schrödinger's cat
- Topologically protected Bell-cat states in a simple spin model
- Hybrid Rabi interaction with traveling states of light
- Modular variable laser cooling for efficient entropy extraction
- Fast Ground State to Ground State Separation of Small Ion Crystals
- Mechanical Squeezed-Fock Qubit: Towards Quantum Weak-Force Sensing
- Doubling Qubits in a Trapped-Ion System via Vibrational Dual-Rail Encoding
- Reservoir-Engineered Mechanical Cat States with a Driven Qubit
- Optimizing decoherence in the generation of optical Schrödinger cat states
- Metastability in the Dissipative Quantum Rabi Model
- Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols
- Experimental quantum simulation of superradiant phase transition beyond no-go theorem via antisqueezing
- Stabilization of product states and excited-state quantum phase transitions in a coupled qubit-field system
- Line search by quantum logic spectroscopy enhanced with squeezing and statistical tests