%0 Journal Article %D 2023 %T Æ codes %A Shubham P. Jain %A Eric R. Hudson %A Wesley C. Campbell %A Victor V. Albert %X

Diatomic molecular codes [{arXiv:1911.00099}] are designed to encode quantum information in the orientation of a diatomic molecule, allowing error correction from small torques and changes in angular momentum. Here, we directly study noise native to atomic and molecular platforms -- spontaneous emission, stray electromagnetic fields, and Raman scattering -- and derive simple necessary and sufficient conditions for codes to protect against such noise. We identify existing and develop new absorption-emission (Æ) codes that are more practical than molecular codes, require lower average momentum, can directly protect against photonic processes up to arbitrary order, and are applicable to a broader set of atomic and molecular systems.

%8 11/21/2023 %G eng %U https://arxiv.org/abs/2311.12324 %0 Journal Article %J Physical Review Letters %D 2013 %T Quantum Catalysis of Magnetic Phase Transitions in a Quantum Simulator %A Philip Richerme %A Crystal Senko %A Simcha Korenblit %A Jacob Smith %A Aaron Lee %A Rajibul Islam %A Wesley C. Campbell %A Christopher Monroe %X We control quantum fluctuations to create the ground state magnetic phases of a classical Ising model with a tunable longitudinal magnetic field using a system of 6 to 10 atomic ion spins. Due to the long-range Ising interactions, the various ground state spin configurations are separated by multiple first-order phase transitions, which in our zero temperature system cannot be driven by thermal fluctuations. We instead use a transverse magnetic field as a quantum catalyst to observe the first steps of the complete fractal devil's staircase, which emerges in the thermodynamic limit and can be mapped to a large number of many-body and energy-optimization problems. %B Physical Review Letters %V 111 %8 2013/9/5 %G eng %U http://arxiv.org/abs/1303.6983v2 %N 10 %! Phys. Rev. Lett. %R 10.1103/PhysRevLett.111.100506