State-to-state control of ultracold molecular reactions
- URL: http://arxiv.org/abs/2005.10820v2
- Date: Thu, 19 Nov 2020 16:42:38 GMT
- Title: State-to-state control of ultracold molecular reactions
- Authors: Ming-Guang Hu, Yu Liu, Matthew A. Nichols, Lingbang Zhu, Goulven
Qu\'em\'ener, Olivier Dulieu, and Kang-Kuen Ni
- Abstract summary: Quantum control of reactive systems has enabled microscopic probes of underlying interaction potentials.
We realize this goal through the nuclear spin degree of freedom.
We are able to control both the inputs and outputs of a bimolecular reaction with quantum state resolution.
- Score: 3.087423765603519
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum control of reactive systems has enabled microscopic probes of
underlying interaction potentials, the opening of novel reaction pathways, and
the alteration of reaction rates using quantum statistics. However, extending
such control to the quantum states of reaction outcomes remains challenging. In
this work, we realize this goal through the nuclear spin degree of freedom, a
result which relies on the conservation of nuclear spins throughout the
reaction. Using resonance-enhanced multiphoton ionization spectroscopy to
investigate the products formed in bimolecular reactions between ultracold KRb
molecules, we find that the system retains a near-perfect memory of the
reactants' nuclear spins, manifested as a strong parity preference for the
rotational states of the products. We leverage this effect to alter the
occupation of these product states by changing the coherent superposition of
initial nuclear spin states with an external magnetic field. In this way, we
are able to control both the inputs and outputs of a bimolecular reaction with
quantum state resolution. The techniques demonstrated here open up the
possibilities to study quantum interference between reaction pathways, quantum
entanglement between reaction products, and ultracold reaction dynamics at the
state-to-state level.
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