Quantum register of fermion pairs

Hartke, Thomas; Oreg, Botond; Jia, Ningyuan; Zwierlein, Martin

doi:10.1038/s41586-021-04205-8

Cited by 23 publications

(14 citation statements)

References 64 publications

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“…Complementary to mean-field studies of interacting many-particle systems, analysis of the two-fermion bound state in vacuum sheds a different light on pairing that can provide crucial insight, e.g., into the strong-coupling (BEC) limit of tightly bound dimers. Dimers of fermionic atoms are further of interest in their own right, e.g., as providing qubits for quantum information processing [27]. We consider two particles (atoms) interacting only via isotropic, short range, and attractive low-energy s-wave scattering under the influence of synthetic spin-orbit coupling.…”

Section: Introductionmentioning

confidence: 99%

Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting

2022

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We theoretically study spin-1/2 fermions confined to two spatial dimensions and experiencing isotropic short-range attraction in the presence of both spin-orbit coupling and Zeeman spin splitting -- a prototypical system for developing topological superfluidity in the many-body sector. Exact solutions for two-particle bound states are found to have a triplet contribution that dominates over the singlet part in an extended region of parameter space where the combined Zeeman- and center-of-mass-motion-induced spin-splitting energy is large. The triplet character of dimers is purest in the regime of weak s-wave interaction strength. Center-of-mass momentum is one of the parameters determining the existence of bound states, which we map out for both two- and one-dimensional types of spin-orbit coupling. Distinctive features emerging in the orbital part of the bound-state wave function, including but not limited to its p-wave character, provide observable signatures of unconventional pairing.

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Section: Introductionmentioning

confidence: 99%

Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting

2022

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“…Equations (1,2) and (4,5) are the main results of this paper. In the following, we establish the notation and theoretical framework to analyze the irreversible construction of information chains, which are used to prove these results, to address thermodynamic meaning and to deduce consequences.…”

Section: Resultsmentioning

confidence: 99%

“…Information management involves dynamic operations on a chain of physical objects carrying symbolic meaning. Such operations, technologically revolutionizing at atomic scales, comprise both physical manipulations of the objects, including mechanical maneuvering of or electromagnetic interactions with them, and purely configurational changes in the resulting sequence of symbols [1][2][3][4] . As a consequence, the chain-like system exchanges energy with the environment.…”

Section: Introductionmentioning

confidence: 99%

Fluctuation relations for irreversible emergence of information

Arias-González

2022

Preprint

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Information theory and Thermodynamics have developed closer in the last years, with a growing application palette in which the formal equivalence between the Shannon and Gibbs entropies is exploited. The main barrier to connect both disciplines is the fact that information does not imply a dynamics, whereas thermodynamic systems unfold with time, often away from equilibrium. Here, we analyze chain-like systems comprising linear sequences of physical objects carrying symbolic meaning. We show that, after defining a reading direction, both reversible and irreversible informations emerge naturally from the principle of microscopic reversibility in the evolution of the chains driven by a protocol. We find fluctuation equalities that relate entropy, the relevant concept in communication, and energy, the thermodynamically significant quantity, examined along sequences whose content evolves under writing and revision protocols. Our results are applicable to nanoscale chains, where information transfer is subject to thermal noise, and extendable to virtually any communication system.

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“…This limitation could be overcome by making use of the blockade of stimulated emission instead, which would provide more tunability, but a cooling scheme has not been designed for it yet. Additionally, the mechanism shows similarities with conduction phenomena in semi-conductor materials and could be used to perform quantum simulations of such materials, or be of great interest for the growing field of quantum logic and information processing with fermionic species 33 by removing the constraint to map the fermionic degrees of freedom into qubits 34 , 35 .…”

Section: Discussionmentioning

confidence: 99%

Pauli blocking of stimulated emission in a degenerate Fermi gas

et al. 2022

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The Pauli exclusion principle in quantum mechanics has a profound influence on the structure of matter and on interactions between fermions. Almost 30 years ago it was predicted that the Pauli exclusion principle could lead to a suppression of spontaneous emission, and only recently several experiments confirmed this phenomenon. Here we report that this so-called Pauli blockade not only affects incoherent processes but also, more generally, coherently driven systems. It manifests itself as an intriguing sub-Doppler narrowing of a doubly-forbidden transition profile in an optically trapped Fermi gas of 3He. By actively pumping atoms out of the excited state, we break the coherence of the excitation and lift the narrowing effect, confirming the influence of Pauli blockade on the transition profile. This insight into the interplay between quantum statistics and coherent driving is a promising development for future applications involving fermionic systems.

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Quantum register of fermion pairs

Cited by 23 publications

References 64 publications

Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting

Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting

Fluctuation relations for irreversible emergence of information

Pauli blocking of stimulated emission in a degenerate Fermi gas

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