Maxwell's demon based on a single qubit

  title={Maxwell's demon based on a single qubit},
  author={Jukka P. Pekola and Dmitry S. Golubev and Dmitri V. Averin},
  journal={Physical Review B},
We propose and analyze Maxwell's demon based on a single qubit with avoided level crossing. Its operation cycle consists of adiabatic drive to the point of minimum energy separation, measurement of the qubit state, and conditional feedback. We show that the heat extracted from the bath at temperature $T$ can ideally approach the Landauer limit of $k_BT\ln 2$ per cycle even in the quantum regime. Practical demon efficiency is limited by the interplay of Landau-Zener transitions and coupling to… 

Figures from this paper

Extended quantum Maxwell demon acting over macroscopic distances
A quantum Maxwell demon is a device that can lower the entropy of a quantum system by providing it with purity. The functionality of such a quantum demon is rooted in a quantum mechanical SWAP
Observing a quantum Maxwell demon at work
A Maxwell demon experiment that tracks the state of each constituent in both the classical and quantum regimes is realized that is able to fully characterize the demon’s memory after the work extraction and show that it takes full part in the thermodynamic process.
Autonomous quantum Maxwell's demon based on two exchange-coupled quantum dots.
The calculated entropy production in a single subsystem and information flow between the subsystems are shown to obey a local form of the second law of thermodynamics, similar to the one previously derived for classical bipartite systems.
H-theorem and Maxwell demon in quantum physics
The Second Law of Thermodynamics states that temporal evolution of an isolated system occurs with non-diminishing entropy. In quantum realm, this holds for energy-isolated systems the evolution of
Entropy Dynamics in the System of Interacting Qubits
The classical second law of thermodynamics demands that an isolated system evolves with a nondiminishing entropy. This holds as well in quantum mechanics if the evolution of the energy-isolated
Otto refrigerator based on a superconducting qubit: Classical and quantum performance
We analyse a quantum Otto refrigerator based on a superconducting qubit coupled to two LC-resonators each including a resistor acting as a reservoir. We find various operation regimes: nearly
Reversing the Landauer's erasure: Single-electron Maxwell's demon operating at the limit of thermodynamic efficiency
According to Landauer's principle, erasure of information is the only part of a computation process that unavoidably involves energy dissipation. If done reversibly, such an erasure generates the
Quantum systems under frequency modulation.
The purpose of this review is to present some of the fundamental effects that arise in a quantum system when its transition frequencies are modulated, from two-state atoms and harmonic oscillators to multilevel and many-particle systems.
Exploiting clock transitions for the chemical design of resilient molecular spin qubits†
A python-based computational tool is employed for the systematic theoretical analysis and chemical optimization of CTs, which arise at anticrossings between spin energy levels and constitute a rich source of physical phenomena in very different kinds of quantum systems.