Abstract
This work is a pedagogical survey about the hierarchical equations of motion and their implementation with the tensor-train format. These equations are a great standard in non-perturbative non-Markovian open quantum systems. They are exact for harmonic baths in the limit of relevant truncation of the hierarchy. We recall the link with the perturbative second-order time convolution equations also known as the Bloch–Redfield equations. Some theoretical tools characterizing non-Markovian dynamics such as the non-Markovianity measures or the dynamical map are also briefly discussed in the context of HEOM simulations. The main points of the tensor-train expansion are illustrated in an example with a qubit interacting with a bath described by a Lorentzian spectral density. Finally, we give three illustrative applications in which the system–bath coupling operator is similar to that of the analytical treatment. The first example revisits a model in which population-to-coherence transfer via the bath creates a long-lasting coherence between two states. The second one is devoted to the computation of stationary absorption and emission spectra. We illustrate the link between the spectral density and the Stokes shift in situations with and without nonadiabatic interaction. Finally, we simulate an excitation transfer when the spectral density is discretized by undamped modes to illustrate a situation in which the TT formulation is more efficient than the standard one.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.]
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Acknowledgements
This work was performed within the French GDR 686 3575 THEMS. We want to dedicate this work to the memory of Christoph Meier and Osman Atabek. Both authors made significant contributions to the research areas described above, such as the Meier–Tannor spectral density and the introduction of the auxiliary matrices. Both have also greatly contributed to many strategies of quantum control in a wide range of processes such as molecular orientation, dynamics of excited states, isomerization, molecular cooling to cite only few. Dominik Domin is warmly acknowledged for his efficient technical support.
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Appendix: Numerical implementation of HEOM with ttpy
Appendix: Numerical implementation of HEOM with ttpy
Most of the TT algebra is carried out by the ttpy package developed by Oseledets and coworkers [122]. In this appendix, we show a minimal code to build the system Liouvillian and time-integrate a given system density matrix with initial system–bath factorization in TT format with Python3, Numpy and ttpy packages.
The system Liouvillian is defined as \({{\mathcal {L}}_{S(\text{ADO})}}=-i(H\otimes {{I}_{n}}-{{I}_{n}}\otimes H)\) where H is the system Hamiltonian, \(I_n\) the identity matrix with n the number of system states. Thus, \({{\mathcal {L}}_{S(\text{ADO})}}\) is a \(n^2 \times n^2\) matrix which can be built from standard numpy functions (np.eye returns the identity matrix and np.kron the Kronecker product of both matrices):
where ids is the identity matrix of size \(n \times n\) and j the imaginary unit. To convert this numpy array to a TT format, tt.matrix routine performs an approximation of \({{\mathcal {L}}_{S(\text{ADO})}}\) for a maximal rank (rmax) and an accuracy eps:
where Ls is the system Liouvillian super-operator. At this point, we are still only dealing with a representation of an array of \(n^2 \times n^2\) dimensions. The HEOM super-operator \({\mathcal {L}}_{S}\) which spans over the whole Liouville space is defined as \({\mathcal {L}}_S = {\mathcal {L}}_{S(\text{ADO})} \otimes \prod _{k''=1}^K I_{n_{\textrm{HEOM}}} .\) To avoid memory issues due to the high dimensionality of the array, one must work with the Kronecker products (tt.kron) of ttpy packages instead of the one of numpy (np.kron). Indeed, numpy will build the full tensor which can be very large and thus might suffer from the dimensionality curse. To carry out this task, a single loop iterates over the number of artificial decay modes K with successive Kronecker products:
The total Liouvillian super-operator \({\mathcal {L}}\) is a sum of several other super-operators, i.e., \({\mathcal {L}}_{k'},\) \({\mathcal {L}}_{k'+},\) \({\mathcal {L}}_{k'-}\) (see Eq. (26)). Addition can be performed directly with the usual algebraic symbol (+) on TT objects. The ttpy library carries out automatically the correct tensor operations. However, tensor ranks increase at each iteration. Thus, rounding operations are regularly performed to reduce the rank for a given accuracy and maximum rank with the following command:
where L is the total HEOM Liouvillian super-operator.
The initial vectorized density matrix is defined directly from its cores. The first core is filled with the initial system density matrix. As all auxiliary density matrices are vectors of zeros when assuming system–bath factorization all the other cores are vectors of dimensions \(n_{\textrm{HEOM}}\) with only the first index equal to 1.
For a given system density matrix rho defined as a numpy array and r the initial core rank (equal to 1) in this example, we compute rho the initial density matrix in TT format with the following algorithm:
Time integration is performed with the KSL second-order splitting algorithm [120]. For each time step dt, the density matrix in TT format is updated using the function ksl implemented in tt.ksl routines:
By iterating over the desired number of timesteps, we compute the full density matrix at time t. To extract the system density matrix, projection techniques (by expressing projectors on the full Liouville space in the TT format) or core manipulations can be used.
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Mangaud, E., Jaouadi, A., Chin, A. et al. Survey of the hierarchical equations of motion in tensor-train format for non-Markovian quantum dynamics. Eur. Phys. J. Spec. Top. 232, 1847–1869 (2023). https://doi.org/10.1140/epjs/s11734-023-00919-0
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DOI: https://doi.org/10.1140/epjs/s11734-023-00919-0