Long-lived coherences in strongly interacting spin ensembles
- URL: http://arxiv.org/abs/2309.15444v1
- Date: Wed, 27 Sep 2023 07:16:06 GMT
- Title: Long-lived coherences in strongly interacting spin ensembles
- Authors: William K. Schenken, Simon A. Meynell, Francisco Machado, Bingtian Ye,
Claire A. McLellan, Maxime Joos, V. V. Dobrovitski, Norman Y. Yao, Ania C.
Bleszynski Jayich
- Abstract summary: A simple Carr-Purcell Meiboom-Gill (CPMG)-like pulse sequence can be leveraged to enhance the coherence of a large ensemble of spin qubits.
We implement the periodic drive on an ensemble of dense nitrogen-vacancy (NV) centers in diamond.
We find that rotation offsets deviating from the ideal pi-pulse in the CPMG sequence play a critical role in preserving coherence even at nominally zero rotation offset.
- Score: 0.7528462379265576
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Periodic driving has emerged as a powerful tool to control, engineer, and
characterize many-body quantum systems. However, the required pulse sequences
are often complex, long, or require the ability to control the individual
degrees of freedom. In this work, we study how a simple Carr-Purcell
Meiboom-Gill (CPMG)-like pulse sequence can be leveraged to enhance the
coherence of a large ensemble of spin qubits and serve as an important
characterization tool. We implement the periodic drive on an ensemble of dense
nitrogen-vacancy (NV) centers in diamond and examine the effect of pulse
rotation offset as a control parameter on the dynamics. We use a single diamond
sample prepared with several spots of varying NV density, which, in turn,
varies the NV-NV dipolar interaction strength. Counter-intuitively, we find
that rotation offsets deviating from the ideal {\pi}-pulse in the CPMG sequence
(often classified as pulse errors) play a critical role in preserving coherence
even at nominally zero rotation offset. The cause of the coherence preservation
is an emergent effective field that scales linearly with the magnitude of the
rotation offset. In addition to extending coherence, we compare the rotation
offset dependence of coherence to numerical simulations to measure the disorder
and dipolar contributions to the Hamiltonian to quantitatively extract the
densities of the constituent spin species within the diamond.
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