US 12,405,247 B2
Methods and systems for protecting coherence in qubits
Kevin C. Miao, Chicago, IL (US); and David D. Awschalom, Chicago, IL (US)
Assigned to The University of Chicago, Chicago, IL (US)
Appl. No. 17/998,316
Filed by The University of Chicago, Chicago, IL (US)
PCT Filed May 10, 2021, PCT No. PCT/US2021/031569
§ 371(c)(1), (2) Date Nov. 9, 2022,
PCT Pub. No. WO2022/015399, PCT Pub. Date Jan. 20, 2022.
Claims priority of provisional application 63/023,579, filed on May 12, 2020.
Prior Publication US 2023/0314374 A1, Oct. 5, 2023
Int. Cl. G01N 27/82 (2006.01); G06N 10/40 (2022.01)
CPC G01N 27/82 (2013.01) [G06N 10/40 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing a quantum system having a first quantum state, a second quantum state, and a third quantum state corresponding to a first energy level, a second energy level, and a third energy level forming a first quantum subspace;
applying a dressing drive field, resonant with an energy splitting between the second and third energy levels, to induce a hybridization of the dressing drive field and the second and third energy levels to generate a fourth hybridized state and a fifth hybridized state wherein the first quantum state, the fourth hybridized state and the fifth hybridized state form a second quantum subspace with enhanced coherence protection of a quantum state of the quantum system from environmental noises over the first quantum subspace;
performing a coherent control of a quantum superposition in the second quantum subspace while maintaining the dressing drive field;
mapping the quantum superposition in the second quantum subspace to the first quantum subspace; and
reading out the quantum superposition in the first quantum subspace.