Experimental implementation of fully controlled dephasing dynamics and synthetic spectral densities

Liu, Zhao‐Di; Lyyra, Henri; Sun, Yong-Nan; Liu, Bi-Heng; Li, Chuan‐Feng; Guo, Guang‐Can; Maniscalco, Sabrina; Piilo, Jyrki

doi:10.1038/s41467-018-05817-x

Cited by 60 publications

(64 citation statements)

References 32 publications

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“…This is also in line with our classification of such pure dephasing as classical [17] since it is a statistical mixture of rotations at different angular velocities. Meanwhile, the experimental simulation of pure dephasing is implemented in a similar spirit [29][30][31]. Canonical Hamiltonian-ensemble representation.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it also constitutes one of the main obstacles in the fabrication and manipulation of quantum information devices [23][24][25][26][27][28]. Different implementations for the simulation of controlled pure dephasing [29][30][31] and its mitigation [32][33][34][35][36] exist. Other experiments highlight the potential of decoherence or pure dephasing to contribute positively to certain quantum information tasks, such as entanglement stabilization [37] or entanglement swap [38].…”

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confidence: 99%

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Quantifying the nonclassicality of pure dephasing

Chen

Gneiting

et al. 2019

Nat Commun

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One of the central problems in quantum theory is to characterize, detect, and quantify quantumness in terms of classical strategies. Dephasing processes, caused by non-dissipative information exchange between quantum systems and environments, provides a natural platform for this purpose, as they control the quantum-to-classical transition. Recently, it has been shown that dephasing dynamics itself can exhibit (non)classical traits, depending on the nature of the system-environment correlations and the related (im)possibility to simulate these dynamics with Hamiltonian ensembles–the classical strategy. Here we establish the framework of detecting and quantifying the nonclassicality for pure dephasing dynamics. The uniqueness of the canonical representation of Hamiltonian ensembles is shown, and a constructive method to determine the latter is presented. We illustrate our method for qubit, qutrit, and qubit-pair pure dephasing and describe how to implement our approach with quantum process tomography experiments. Our work is readily applicable to present-day quantum experiments.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Quantifying the nonclassicality of pure dephasing

Chen

Gneiting

et al. 2019

Nat Commun

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“…From one perspective, a wide variety of experimental platforms, including atom-cavity and trapped-ion systems [13], solid-state devices [14], and photonic band-gap materials [15], have been shown to feature regimes where non-Markovian and strong-coupling effects play an significant role in the description of the dynamics. At the same time, the increasing ability to coherently control the non-Markovian dynamics of quantum systems through, e.g., the use of reservoir engineering techniques [16][17][18][19][20][21], has provided new avenues to explore how certain types of environmental noise might be useful for the implementation of quantum technologies; notably, quantum information processing and quantum metrology have been recognized to possibly benefit from non-Markovian noise sources [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Generalized theory of pseudomodes for exact descriptions of non-Markovian quantum processes

Pleasance

Garraway

Petruccione

2020

Phys. Rev. Research

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We develop an exact framework for describing the non-Markovian dynamics of an open quantum system interacting with an environment modeled by a generalized spectral density function. The approach relies on mapping the initial system onto an auxiliary configuration, comprising the original open system coupled to a small number of discrete modes, which in turn are each coupled to an independent Markovian reservoir. Based on the connection between the discrete modes and the poles of the spectral density function, we show how expanding the system using the discrete modes allows for the full inclusion non-Markovian effects within an enlarged open system whose dynamics is governed by an exact Lindblad master equation. Initially we apply this result to obtain a generalization of the pseudomode method [B. M. Garraway, Phys. Rev. A. 55, 2290 (1997)] in cases where the spectral density function has a Lorentzian structure. For many other types of spectral density function, we extend our proof to show that an open system dynamics may be modeled physically using discrete modes which admit a non-Hermitian coupling to the system and for such cases determine the equivalent master equation to no longer be of Lindblad form. For applications involving two discrete modes, we demonstrate how to convert between pathological and Lindblad forms of the master equation using the techniques of the pseudomode method.

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“…Experimental results on quantum reservoir engineering, including the possibility to design desired forms of non-Markovian dynamics [17][18][19][20][21][22][23][24][25], naturally lead to the question of whether or not memory effects are useful for quantum technologies, in the sense of constituting a resource for certain tasks [15,[26][27][28][29][30][31]. This question has not yet been satisfactorily answered.…”

Section: Introductionmentioning

confidence: 99%

IBM Q Experience as a versatile experimental testbed for simulating open quantum systems

García-Pérez¹,

Rossi²,

Maniscalco³

2020

npj Quantum Inf

Self Cite

286

107

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The advent of Noisy Intermediate-Scale Quantum (NISQ) technology is changing rapidly the landscape and modality of research in quantum physics. NISQ devices, such as the IBM Q Experience, have very recently proven their capability as experimental platforms accessible to everyone around the globe. Until now, IBM Q Experience processors have mostly been used for quantum computation and simulation of closed systems. Here we show that these devices are also able to implement a great variety of paradigmatic open quantum systems models, hence providing a robust and flexible testbed for open quantum systems theory. During the last decade an increasing number of experiments have successfully tackled the task of simulating open quantum systems in different platforms, from linear optics to trapped ions, from Nuclear Magnetic Resonance (NMR) to Cavity Quantum Electrodynamics. Generally, each individual experiment demonstrates a specific open quantum system model, or at most a specific class. Our main result is to prove the great versatility of the IBM Q Experience processors. Indeed, we experimentally implement one and two-qubit open quantum systems, both unital and non-unital dynamics, Markovian and non-Markovian evolutions. Moreover, we realise proof-of-principle reservoir engineering for entangled state generation, demonstrate collisional models, and verify revivals of quantum channel capacity and extractable work, caused by memory effects. All these results are obtained using IBM Q Experience processors publicly available and remotely accessible online. arXiv:1906.07099v1 [quant-ph]

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Experimental implementation of fully controlled dephasing dynamics and synthetic spectral densities

Cited by 60 publications

References 32 publications

Quantifying the nonclassicality of pure dephasing

Quantifying the nonclassicality of pure dephasing

Generalized theory of pseudomodes for exact descriptions of non-Markovian quantum processes

IBM Q Experience as a versatile experimental testbed for simulating open quantum systems

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