Quantum Refrigeration
1. Introduction: What is Quantum Refrigeration? At first glance, “quantum refrigeration” might sound like a futuristic idea. But in reality, it’s a powerful and emerging concept in the field of….
Category: Quantum Computing
Entropy Production in Quantum Systems
1. Introduction: What Is Entropy Production? In both classical and quantum physics, entropy production is a central concept in understanding irreversibility. While classical thermodynamics defines entropy as a measure of….
Quantum Statistical Mechanics
1. Introduction: Bridging Quantum Mechanics and Thermodynamics Quantum Statistical Mechanics is the branch of physics that merges quantum mechanics with statistical methods to describe systems containing a large number of….
Thermodynamic Cost of Quantum Operations
1. Introduction: Energy and Information in Quantum Physics In classical thermodynamics, every physical operation—like lifting a weight or heating a cup of coffee—requires energy. Quantum physics extends this idea to….
Quantum Maxwell’s Demon
1. Classical Background: Who is Maxwell’s Demon? In 1867, physicist James Clerk Maxwell proposed a thought experiment that became famous in thermodynamics and information theory. He imagined a tiny, intelligent….
Fluctuation Theorems in Quantum Systems
1. Classical Thermodynamics and the Second Law In classical thermodynamics, the Second Law says that entropy in an isolated system never decreases over time. It’s a rule that describes the….
Quantum Work and Heat Definitions
1. Classical Foundations: Work and Heat Before diving into the quantum world, let’s revisit what work and heat mean in classical thermodynamics. In classical systems, work and heat are path-dependent….
Quantum Heat Engines
Let’s start with classical physics. A heat engine is a system that extracts useful work from heat energy flowing between two sources at different temperatures. The steam engine is a….
Robustness in Quantum Control
Quantum control is the science of manipulating quantum systems—such as atoms, photons, or qubits—to reach specific desired outcomes. These might include performing logic gates for a quantum computer, stabilizing a….
Quantum Control of Open Systems
Quantum systems are delicate. Unlike classical systems, they can exist in superpositions, entangle with other particles, and show interference patterns. But these beautiful quantum effects are easily disrupted by interactions….