Year: 2022
Type: article
Abstract: We investigate assisted enhancement of quantum coherence in a bipartite setting with control and target systems, which converts the coherence of the control qubit into the enhanced coherence of the target qubit. We assume that only incoherent operations and measurements can be applied locally and classical information can be exchanged. In addition, the two subsystems are also coupled by a fixed Hamiltonian whose interaction strength can be controlled. This coupling does not generate any local coherence from incoherent input states. We show that in this setting a measurement and feed-forward based protocol can deterministically enhance the coherence of the target system while fully preserving its purity. The protocol can be iterated and several copies of the control state can be consumed to drive the target system arbitrarily close to a maximally coherent state. We experimentally demonstrate this protocol with a photonic setup and observe the enhancement of coherence for up to five iterations of the protocol.
Source: Scientific Reports
Institution: Palacký University Olomouc
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,190
Awards: Short-Range Optical Quantum Connections, G1189858107, G1301723534, Highly nonlinear operations with superconducting quantum oscillators, G1953887145, Photonic simulators of quantum thermodynamic systems, G3443510363, G4012392158, G4333668372, G434337789, G4345038503, G4578358810, G4937468798, Twinning in non-Gaussian Physics for Quantum Technology, G5238230596, QuantERA ERA-NET Cofund in Quantum Technologies, G5985791234, G7335216703, G8653124682
OpenAlex ID: W4312207895