Nonreciprocal quantum transport at junctions of structured leads

Mascarenhas, Eduardo; Damanet, François; Flannigan, Stuart; Tagliacozzo, Luca; Daley, Andrew J.; Goold, John; Vega, Inés de

doi:10.1103/physrevb.99.245134

Cited by 22 publications

(16 citation statements)

References 80 publications

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“…Biasdirection-dependent properties is generally a desired feature of nanoscale devices, and are known to result from the presence of asymmetry and nonlinearity. Nonreciprocal transport at the quantum level has been investigated in spin [52][53][54][55][56][57][58][59][60] and QD systems [61][62][63][64][65]. This includes the paradigmatic Pauli Blockade effects in a double-QD junction, where a nonreciprocal electron current has been observed for asymmetric QD energy levels [62].…”

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confidence: 99%

Controlling Quantum Transport via Dissipation Engineering

et al. 2019

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Inspired by the microscopic control over dissipative processes in quantum optics and cold atoms, we develop an open-system framework to study dissipative control of transport in strongly interacting fermionic systems, relevant for both solid state and cold atom experiments. We show how subgap currents exhibiting Multiple Andreev Reflections -the stimulated transport of electrons in the presence of Cooper-pairs -can be controlled via engineering of superconducting leads or superfluid atomic gases. Our approach incorporates dissipation within the channel, which is naturally occurring and can be engineered in cold gas experiments. This opens opportunities for engineering many phenomena with transport in strongly interacting systems. As examples, we consider particle loss and dephasing, and note different behaviour for currents with different microscopic origin. We also show how to induce nonreciprocal electron and Cooper-pair currents.Introduction. Understanding and controlling the outof-equilibrium dynamics of strongly interacting manybody systems constitutes one of the key forefronts in quantum physics across a variety of subfields in experiment and theory. In this context, opportunities to achieve their control via dissipation mechanisms have arisen [1,2], as is applied for few-body systems in quantum optics [3,4]. This is especially true in cold-atom platforms, where large separations between frequency scales allows well-controlled theoretical models and implementations of dissipative processes, as realized for laser cooling and trapping [5]. The longer timescales of cold atom experiments also allow dynamics to be tracked and potentially controlled time-dependently [6,7]. Outof-equilibrium transport dynamics remain a ubiquitous paradigm in the solid state [8], and recent developments in cold atom systems have also made it possible to engineer quantised transport of atoms between reservoirs, as well as quantum point contacts and waveguides [9][10][11][12]. Here we explore the emerging new opportunity of using dissipation engineering to achieve control of quantum transport properties, that are relevant for both coldatom and solid-state platforms.

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confidence: 99%

Controlling Quantum Transport via Dissipation Engineering

et al. 2019

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“…[42], or failure in grasping the critical behavior [43]. This spurred the quantum information community to investigate the emerging differences between global and local master equations [44][45][46][47][48][49][50][51][52][53][54][55] and on finding possible alternative schemes [56][57][58][59][60][61].…”

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confidence: 99%

Self-consistent microscopic derivation of Markovian master equations for open quadratic quantum systems

D'Abbruzzo,

Rossini

2021

Preprint

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We provide a rigorous construction of Markovian master equations for a wide class of quantum systems that encompass quadratic models of finite size, linearly coupled to an environment modeled by a set of independent thermal baths. Our theory can be applied both for fermionic and bosonic models in any number of physical dimensions, and does not require any particular spatial symmetry of the global system. We show that, under reasonable assumptions on the baths, the Lamb-shift correction to the system Hamiltonian can be neglected and the effective Lindblad operators are the normal modes of the system, with coupling constants that explicitly depend on the transformation matrices that diagonalize the Hamiltonian. Both the dynamics and the steady-state (guaranteed to be unique) properties can be obtained with a polynomial amount of resources in the system size. We also address the particle and energy current flowing through the system in a minimal twobath scheme and find that they hold the structure of Landauer's formula, being thermodynamically consistent.

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“…They work as essential isolators and circulators to protect the laser source and eliminate the Fabry-Perot effect. In quantum information processing, non-reciprocal devices can be used to explore quantum transfer in optical systems [9]. Further, by designing networks for non-reciprocal devices, it is possible to construct directional, quantum-limited amplifiers [10].…”

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confidence: 99%

Single-photon non-reciprocity with an integrated magneto-optical isolator

Ren¹,

Yan²,

Feng³

et al. 2021

Preprint

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Non-reciprocal photonic devices are essential components of classical optical information processing. It is interesting and important to investigate their feasibility in the quantum world. In this work, a single-photon non-reciprocal dynamical transmission experiment was performed with an on-chip silicon nitride (SiN)-based magneto-optical (MO) isolator. The measured isolation ratio for single photons achieved was 12.33 dB, consistent with the result of classical test, which proved the functionality of our on-chip isolator. The quantum coherence of the passing single photons was further verified using high-visibility quantum interference. Our work will promote on-chip nonreciprocal photonic devices within the integrated quantum circuits and help introduce novel phenomena in quantum information processes.

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Nonreciprocal quantum transport at junctions of structured leads

Cited by 22 publications

References 80 publications

Controlling Quantum Transport via Dissipation Engineering

Controlling Quantum Transport via Dissipation Engineering

Self-consistent microscopic derivation of Markovian master equations for open quadratic quantum systems

Single-photon non-reciprocity with an integrated magneto-optical isolator

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