研究目的
Investigating the performance of a thermodynamic quantum engine based on a double quantum dot that extracts energy from a single thermal bath, fueled by entanglement between electron spins.
研究成果
The proposed quantum engine can extract work from a single thermal bath by consuming entanglement as fuel. It operates optimally in the long-time limit and shows potential for practical applications in quantum computing and simulators by utilizing leftover entangled states.
研究不足
The engine's performance is limited by the time required for thermalization and the need to supply singlet states. The practical implementation also depends on the ability to control the tunnel coupling precisely.
1：Experimental Design and Method Selection:
The engine is based on the singlet and triplet states of two coupled spins in a double quantum dot. Its cycle involves changing the inter-QD tunnel coupling which controls the energy difference between the lowest singlet state and the triplets.
2：Sample Selection and Data Sources:
The system consists of two electrons on a double quantum dot, with initial states provided as singlet spin states.
3：List of Experimental Equipment and Materials:
Double quantum dot setup with plunger gates to control orbital energies and a pincher gate to control the tunnel coupling.
4：Experimental Procedures and Operational Workflow:
The cycle starts with the system in a singlet state, increases the tunnel coupling to create an energy gap, allows the system to thermalize, and then decreases the tunnel coupling back to the initial value.
5：Data Analysis Methods:
The work output is calculated based on the change in energy eigenvalues and the probabilities of the system being in singlet or triplet states.
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