State-independent robust heat-bath algorithmic cooling of nuclear spins
arXiv:2303.09087 · doi:10.1103/PhysRevApplied.21.024017
Abstract
In this work, we experimentally demonstrate the implementation of a recently proposed robust and state-independent heat-bath algorithmic cooling (HBAC) method [1] on an NMR quantum processor. While HBAC methods improve the purity of a quantum system via iterative unitary entropy compression, they are difficult to implement experimentally since they use sort operations that are different for each iteration. The new robust HBAC method proved that optimal HBAC is possible without prior state information and using a single fixed operation. We modified the protocol to experimentally perform efficient cooling of 13C and 15N spins and provide an optimal decomposition of this modified protocol in terms of quantum gates. This is the first time that optimal HBAC has been experimentally demonstrated on 15N spins. We examined the relaxation dynamics of these algorithmically cooled spins, in order to ascertain the effect of decoherence on the cooled states.
11 pages, 9 figures
References in corpus (9)
- Quantum algorithm for solving linear systems of equations
- A spin based heat engine: demonstration of multiple rounds of algorithmic cooling
- The Asymptotic Cooling of Heat-Bath Algorithmic Cooling
- Heat Bath Algorithmic Cooled Quantum Otto Engines
- Hyperfine spin qubits in irradiated malonic acid: heat-bath algorithmic cooling
- Novel Technique for Robust Optimal Algorithmic Cooling
- Thermodynamics of a minimal algorithmic cooling refrigerator
- Breaking the limits of purification: Postselection enhances heat-bath algorithmic cooling
- No-go Theorem of Purification