Coherently Coupled Mechanical Oscillators in the Quantum Regime
- URL: http://arxiv.org/abs/2205.14841v2
- Date: Sun, 19 Jun 2022 17:57:18 GMT
- Title: Coherently Coupled Mechanical Oscillators in the Quantum Regime
- Authors: Pan-Yu Hou, Jenny J. Wu, Stephen D. Erickson, Daniel C. Cole, Giorgio
Zarantonello, Adam D. Brandt, Andrew C. Wilson, Daniel H. Slichter, and
Dietrich Leibfried
- Abstract summary: We show coherent exchange of single motional quanta between harmonic oscillators.
We demonstrate high-fidelity quantum state transfer, entanglement of motional modes, and Hong-Ou-Mandel-type interference.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Coupled harmonic oscillators are ubiquitous in physics and play a prominent
role in quantum science. They are a cornerstone of quantum mechanics and
quantum field theory, where second quantization relies on harmonic oscillator
operators to create and annihilate particles. Descriptions of quantum
tunneling, beamsplitters, coupled potential wells, "hopping terms", decoherence
and many other phenomena rely on coupled harmonic oscillators. Despite their
prominence, only a few experimental systems have demonstrated direct coupling
between separate harmonic oscillators; these demonstrations lacked the
capability for high-fidelity quantum control. Here, we realize coherent
exchange of single motional quanta between harmonic oscillators -- in this
case, spectrally separated harmonic modes of motion of a trapped ion crystal
where the timing, strength, and phase of the coupling are controlled through
the application of an oscillating electric field with suitable spatial
variation. We demonstrate high-fidelity quantum state transfer, entanglement of
motional modes, and Hong-Ou-Mandel-type interference. We also project a
harmonic oscillator into its ground state by measurement and preserve that
state during repetitions of the projective measurement, an important
prerequisite for non-destructive syndrome measurement in continuous-variable
quantum error correction. Controllable coupling between harmonic oscillators
has potential applications in quantum information processing with continuous
variables, quantum simulation, and precision measurements. It can also enable
cooling and quantum logic spectroscopy involving motional modes of trapped ions
that are not directly accessible.
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