coherence and decoherence of open quantum systems ...hs quantum biology-- recent experimental...
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Coherence and decoherence of open quantum systems (OQS)
HS Quanteninformation: Quantum Biology
ITP January 2013
OQS – Master Course
Quantum Many
Body Systems
Interacting many body system
Coherent Phenomena ( inc collective effects)
Entanglement generation, manipulation and control
Decoherence: influence of the environment
OQS – Master Course
Quantum Many Body Systems
Emergence, characterization
and quantification
of quantum correlationsUtilization of quantum features
for simulation, metrology and sensing
Fundamental aspects:
Measures of classicality
and quantum coherence
Canonical Examples of Coherent Dynamics
Quantum Optics (Jaynes Cummings model,
EIT, Superradiance)
Clear relation to actual in house experiments
OQS – Master Course
Description of System - Environment interactions:
Dynamics of Open Quantum Systems: Decoherence
And beyond: Persistence of quantum coherence
in complex many body systems
OQS – Master Course
Quantum Many Body Systems
Emergence, characterization and
quantification of quantum correlations
The dynamics of open quantum
systems: Decoherence
Utilization of quantum features
for simulation, metrology and sensing
Persistence of quantum coherence
in complex many body systems
HS Quantum Biology-- Recent experimental results in energy transfer across types of
Photosynthetic complexes: evidence of quantum coherence
-- Noise assisted transport: Interplaying noise and coherence
for optimal performance
-- Physical origin of long lived quantum (exciton) coherence
(Non-trivial) Quantum Effects
in Biology??
Fenna-Matthew-Olson (FMO) complex
- R.E. Fenna and B.W. Matthews,
Nature 258 573 (1975)
- Y.-C. Cheng & G.R. Fleming,
Annual Reviews of Phys. Chem. 2009
- Schmidt am Busch et al,
The Eighth Bacteriochlorophyll
Completes the Excitation Energy Funnel
in the FMO Protein. J. Phys. Chem. Lett.
2, 93 (2011)
Experimental evidence at
cryogenic and physiological
temperatures indicates the
presence of quantum coherence
Further results: Scholes group
A theoretical model
DephasingPhase randomization
RelaxationEnergy exchange
A Theoretical Model
j
jl
l
No dephasing
Some dephasing
Plenio & Huelga, New J. Phys. 2008
Mohseni, Rebentrost, Lloyd, Aspuru-Guzik, J. Phys. Chem. 2008
More dephasing
Reduction of
destructive
interference
Inhibition
of coupling
through
dephasing
Dependence on Noise Strength
HS Quantum Biology
Theoretical modelling of open quantum systems
Quantification and detection of quantum correlations in
complex systems
Efficient numerical simulation of many body systems
Novel probing schemes: interfacing with quantum probes
Institute of Theoretical Physics (AG Plenio & Huelga)