Information to energy conversion in an electronic Maxwell s demon and thermodynamics of measurements.


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1 Information to energy conversion in an electronic Maxwell s demon and thermodynamics of measurements Stony Brook University, SUNY Dmitri V Averin and iang Deng LowTemperature Lab, Aalto University Jukka P Pekola and M Möttönen Publications: PRL 104, 0601 (010) EPL 96, 6704 (011) PRB 84, (011)
2 Outline 1 Statistical distribution of the heat generated in adiabatic transitions: classical thermal fluctuationdissipation theorem (FDT) Driven singleelectron tunneling (SET) transitions as prototype of reversible information processing 3 Electronic Maxwell s demons based on the SET pump and nsuid array 4 Detector properties in Maxwell s demon operation and thermodynamics of quantum measurements
3 Distribution of heat generated in adiabatic transitions reversible logic operations are adiabatic transitions; potential reversible circuits are based on small, mesoscopic or nano, structures large role of fluctuations Example: driven SET transitions
4 Driven singleelectron tunneling (SET) transitions U ( n) = U U 0 0 ( n) E ( n) = E n n g ( t) n, OP Saira et al, PRB (010); and tbp
5 Noise of the generated heat in driven adiabatic evolution σ = T Slow evolution of a system of levels E n (t) weakly interacting with an equilibrium reservoir, between the two stationary configurations p& m = & n [ p p ], p = p n mn m nm p (0) : p (0) = 0  local equilibrium Heat generated in the reservoir in this evolution = jumps ( tot) ( E ( t) E ( t) ), = T S n m +
6 Average generated irreversible heat = ( / T ) dt E& n, m n ( ) nm E& m p (0) m 1 group inverse: : = ; = ; = Noise in generated heat ~ ) (0 σ = = dt E& n( ) nm E& m pm = Twostate system σ n, m T & ε = ( 1/ ) dt cosh ( ε / T ), ε = E1( t) E( t) + onclusion: irreversibly generated heat vanishes not only on average but for each individual transition protocol
7 Jarzynski equality and statistics of the generated heat exp{ ( F) / T} = 1 W th In the case of deterministic transitions, F= U, and { / T } 1 exp = In the limit of adiabatic switching, this relation and thermal FDT ~ = σ T imply Gaussian probability density of the heat distribution ρ( ) = (1/ 4πT ) 1/ e ( ) / 4T
8 Statistics of heat in driven SET transitions U(t) ne g V g β Thermodynamics of the transitions βσ βλ = U j U ( t = + W j ) = E th, W th dt(n = E g ( t) ) I( t) ndn g ( t) ηβ
9 Nnn 1 n V Electronic Maxwell s demon based on SET pump Informationtoenergy conversion n 1 n N+n 0 g V g1 g V g Alternative approach: G Schaller et al, PRB (011)
10 Generated power: P = ev / 3( ev / 3) Demon inverts the Landauer principle: bit of information gained in a measurement can be used to convert roughly k B T of thermal energy into free energy
11 Maxwell s demon based on nsuid array For M/L 1 dynamics of individual nsuids reduces to that of the differential phase φ describing the circulating current: ], [, cos cos ) ( 4 0 ei E L H J e = Φ + = ϕ ϕ χ ϕ ϕ π
12 Detector properties for demon operation ualitative similarity to quantum measurements: tradeoff between the information acquisition and backaction Standard quantum detector setup: V I 0 1 Heisenberg uncertainty relation for detectors: S I S V ( hλ / 4π ) uantitative requirements for Maxwell s demon: Errorfree and rapid detection: S I / λ << e τ / 8 π, << τ No backaction excitations GT γ / π = d d f ( )[1 f ( )], e S i f i f γ π e ε ε ε ε = ( ε ε U ) + γ S V << ht /[ e i f ln( ω / T )] V / h,
13 JTLbased magnetic flux detector (a) L qubit generator E, J reciever (b) k r(k) U(x) t(k) The detector employs ballistic propagation of individual fluxons in a JTL The measured system controls the fluxon scattering potential: mv h h 1/ H = H 0 + σ zδu ( x) + + U ( x), m ( ), λj = ( ) λ e ei L x J DV A, K Rabenstein, VK Semenov, PRB 73, (006)
14 onclusions Gaussian distribution of the generated heat in the reversible transformations with the width related to average by classical thermal FDT SET structures can be developed into a prototype of thermodynamically reversible devices and a promising tool for studying basic thermodynamics, eg, nonequilibrium fluctuation relations, demonstration of the Maxwell s demon, ; but at low frequencies nsuid arrays would add an advantage of developed support electronics allowing the highfrequency operation both for the development of practical reversible circuits and for fundamental studies of the dynamics of information/entropy in electronic devices, eg, in thermodynamics of quantum measurements
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