A critique of the two level approximation

Keyphrases

• Allowed Transitions 50%
• Approximate Technique 50%
• Caldeira-Leggett 50%
• Coordinate Coupling 50%
• Decoherence 50%
• Decoherence Time 50%
• Dominant Role 50%
• Environment Spectrum 50%
• Linear Coordinates 50%
• Low Temperature 50%
• Multilevel Description 50%
• Non-resonant 50%
• Quantum Fluctuations 50%
• Quantum System 50%
• Resonant Process 50%
• Short Time Scale 50%
• System Environment 50%
• Two-level 50%
• Two-level Approximation 100%
• Wide Energy Range 50%
• Zero Temperature 50%

Mathematics

• Approximates 100%
• Decoherence Time 100%
• Quantum System 100%
• Timescale 100%

Engineering

• Low-Temperature 100%
• Quantum System 100%
• Simplifies 100%