For large or strongly interacting systems, decoherence may occur extraordinarily quickly.
The precise timescale depends on the object's properties, its surroundings, temperature, and the type of interaction involved.
Interference depends on coherent relationships between alternatives.
If those relationships are suppressed, interference visibility decreases.
Experiments can measure this change and compare it with theoretical predictions for the system's interaction with its environment.
Interference depends on coherent relationships between alternatives.
If those relationships are suppressed, interference visibility decreases.
Experiments can measure this change and compare it with theoretical predictions for the system's interaction with its environment.
Physicists use a mathematical object called a density matrix to describe quantum states, including situations where a system is entangled with its surroundings.
Physicists use a mathematical object called a density matrix to describe quantum states, including situations where a system is entangled with its surroundings.
Physicists use a mathematical object called a density matrix to describe quantum states, including situations where a system is entangled with its surroundings.
When the environment becomes correlated with different components of a system, the relative phase information becomes inaccessible to local measurements of that system.
Its observable behavior can then resemble a classical statistical mixture.
When the environment becomes correlated with different components of a system, the relative phase information becomes inaccessible to local measurements of that system.
Its observable behavior can then resemble a classical statistical mixture.
When the environment becomes correlated with different components of a system, the relative phase information becomes inaccessible to local measurements of that system.
Its observable behavior can then resemble a classical statistical mixture.
Coherence refers to well-defined phase relationships between components of a quantum state.
These relationships allow probability amplitudes to combine and produce interference.
Coherence refers to well-defined phase relationships between components of a quantum state.
These relationships allow probability amplitudes to combine and produce interference.
Coherence refers to well-defined phase relationships between components of a quantum state.
These relationships allow probability amplitudes to combine and produce interference.
Decoherence explains why interference becomes inaccessible in many practical situations.
By itself, it does not necessarily explain why one unique measurement outcome is experienced rather than another.
That distinction remains central to the quantum measurement problem.
Decoherence explains why interference becomes inaccessible in many practical situations.
By itself, it does not necessarily explain why one unique measurement outcome is experienced rather than another.
That distinction remains central to the quantum measurement problem.
Decoherence explains why interference becomes inaccessible in many practical situations.
By itself, it does not necessarily explain why one unique measurement outcome is experienced rather than another.
That distinction remains central to the quantum measurement problem.
A perfectly isolated quantum system can preserve coherent relationships between its possible states.
Real systems, however, are rarely isolated completely.
Their surroundings can act as an enormous network of interactions that disperses phase information.
A perfectly isolated quantum system can preserve coherent relationships between its possible states.
Real systems, however, are rarely isolated completely.
Their surroundings can act as an enormous network of interactions that disperses phase information.
A perfectly isolated quantum system can preserve coherent relationships between its possible states.
Real systems, however, are rarely isolated completely.
Their surroundings can act as an enormous network of interactions that disperses phase information.
The information is not necessarily destroyed.
Instead, correlations become distributed across the system and its environment, making the original interference extremely difficult, or practically impossible, to recover by observing the system alone.
The information is not necessarily destroyed.
Instead, correlations become distributed across the system and its environment, making the original interference extremely difficult, or practically impossible, to recover by observing the system alone.
The information is not necessarily destroyed.
Instead, correlations become distributed across the system and its environment, making the original interference extremely difficult, or practically impossible, to recover by observing the system alone.
Imagine an electron, a molecule, or a tiny dust particle.
Light may scatter from it, air molecules may collide with it, and surrounding particles may become correlated with its state.
These interactions can rapidly suppress observable interference.
Imagine an electron, a molecule, or a tiny dust particle.
Light may scatter from it, air molecules may collide with it, and surrounding particles may become correlated with its state.
These interactions can rapidly suppress observable interference.
Imagine an electron, a molecule, or a tiny dust particle.
Light may scatter from it, air molecules may collide with it, and surrounding particles may become correlated with its state.
These interactions can rapidly suppress observable interference.
Quantum decoherence describes how a system loses the ability to display interference between certain components of its quantum state when information about those components spreads into the environment.
Quantum decoherence describes how a system loses the ability to display interference between certain components of its quantum state when information about those components spreads into the environment.
Quantum decoherence describes how a system loses the ability to display interference between certain components of its quantum state when information about those components spreads into the environment.
How does the delicate quantum behavior of microscopic systems become difficult to observe in the macroscopic world?
One major part of the answer is decoherence, the loss of observable quantum interference when a system becomes correlated with its environment.