Experimental achievement of the entanglement-assisted capacity for the depolarizing channel

Chiuri, Andrea; Giacomini, Sandro; Macchiavello, Chiara; Mataloni, Paolo

doi:10.1103/physreva.87.022333

Cited by 14 publications

(18 citation statements)

References 28 publications

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“…Such an EA scenario is widely applicable to radiofrequency communication, deep space communication [21], and covert communication [22,23].Despite the large advantage of EA capacity, a practical EA encoding and decoding scheme that achieves any advantage over the classical capacity is unknown in the high noise regime. Previous experiments [24,25] focused on ideal scenarios with qubits; Although the EA capac- * zhuangquntao@email.arizona.edu ity formula for bosonic Gaussian channel is well established [26,27], the achievability proof in Ref.[1] relies on approximating an infinite dimensional channel as a channel with finite but large dimension; thus a structured encoding scheme is not given for bosonic channels. In fact, simple schemes like continuous-variable (CV) superdense coding [28][29][30] do not beat the classical capacity in the noisy and weak signal regime [31], making experimental demonstrations of the EA capacity advantage elusive [32][33][34].…”

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confidence: 99%

Practical Route to Entanglement-Assisted Communication Over Noisy Bosonic Channels

2020

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Entanglement can offer substantial advantages in quantum information processing, but loss and noise hinder its applications in practical scenarios. Although it has been well known for decades that the classical communication capacity over lossy and noisy bosonic channels can be significantly enhanced by entanglement, no practical encoding and decoding schemes are available to realize any entanglement-enabled advantage. Here, we report structured encoding and decoding schemes for such an entanglement-assisted communication scenario. Specifically, we show that phase encoding on the entangled two-mode squeezed vacuum state saturates the entanglement-assisted classical communication capacity and overcomes the fundamental limit of covert communication without entanglement assistance. We then construct receivers for optimum hypothesis testing protocols under discrete phase modulation and for optimum noisy phase estimation protocols under continuous phase modulation. Our results pave the way for entanglement-assisted communication and sensing in the radiofrequency and microwave spectral ranges. I. INTRODUCTIONEntanglement's benefit for quantum information processing has been revealed by pioneer works in communication [1], sensing [2-4], and computation [5]. Notably, the entanglement-enabled advantages even survive loss and noise in certain scenarios, as predicted [6][7][8] and experimentally demonstrated [9][10][11] in the entanglementenhanced sensing protocol called quantum illumination.It is also known, in theory, that pre-shared entanglement increases the classical communication capacity, i.e., the maximum rate of reliable communication of classical bits (cbits), over a quantum channel Φ. In an ideal case, the superdense-coding [12] protocol allows for sending two cbits on a single qubit, with the assistance of one entanglement bit (ebit). Formally, one characterizes the rate limit of such EA communication by the classical capacity with unlimited entanglement-assistance [1,[13][14][15], C E (Φ) [16]. Compared with the classical capacity without entanglement-assistance, i.e., the Holevo-Schumacher-Westmoreland capacity, C (Φ) [17][18][19], the improvement enabled by entanglement can be drastic even over a noisy channel Φ. In particular, it is known [1] that the ratio of C E (Φ) /C (Φ) can diverge logarithmically with the inverse of signal power over a noisy and lossy bosonic channel [20]. Such an EA scenario is widely applicable to radiofrequency communication, deep space communication [21], and covert communication [22,23].Despite the large advantage of EA capacity, a practical EA encoding and decoding scheme that achieves any advantage over the classical capacity is unknown in the high noise regime. Previous experiments [24,25] focused on ideal scenarios with qubits; Although the EA capac- * zhuangquntao@email.arizona.edu ity formula for bosonic Gaussian channel is well established [26,27], the achievability proof in Ref.[1] relies on approximating an infinite dimensional channel as a channel with finite but large d...

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confidence: 99%

Practical Route to Entanglement-Assisted Communication Over Noisy Bosonic Channels

2020

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“…The two crystals are tuned in such a way that they perform a rapid succession of Pauli operatorsσ x ,σ y ,σ z , thus generating white noise on the state. 32,33 In the inset of Fig. 1a, we show typical experimental curves for the work W ρ (θ, θ) calculated according to Eq.…”

Section: Resultsmentioning

confidence: 99%

Experimental extractable work-based multipartite separability criteria

et al. 2017

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A thermodynamic theory of quantum entanglement as well as the establishment of rigorous formal connections between the laws of thermodynamics and the phenomenology of entanglement are currently open areas of investigation. In this quest, a core problem is embodied by the understanding of the role that entanglement plays in processes of work extraction. Here, by considering information thermodynamics-based protocols, we answer the question "Is it possible to infer, quantitatively, quantum correlations by considering work-extraction schemes?". Our experimental settings consist of suitably designed multi-photon optical interferometers able to address the case of both bipartite and multipartite entangled states. We compare the performance of such criteria to that of witnesses of entanglement based on the violation of Bell-like tests, showing their inherently different nature. Our work contributes strongly to the ongoing efforts in establishing photonic systems as a platform for experiments in information thermodynamics.

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“…This has been implemented by using two liquid crystals, with their axes at 0 • and 45 • , onto the path of one photon. The two crystals are tuned in such a way that they perform a rapid succession of Pauli operatorsσ x ,σ y ,σ z , thus generating white noise on the state [19].…”

Section: When Introducing His Paradigm Maxwell Had In Mindmentioning

confidence: 99%

Experimental entanglement-enhanced work extraction based on a Maxwell’s demon

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Mancino

Orieux

et al. 2016

Conference on Lasers and Electro-Optics

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The relation between the theory of entanglement and thermodynamics is very tight: a thermodynamic theory of quantum entanglement, as well as the establishment of rigorous formal connections between the laws of thermodynamics and the phenomenology of entanglement are currently open areas of investigation. In this quest, an interesting problem is embodied by the role played by entanglement in processes of work extraction from a working medium embodied by quantum information carriers. In this work, we experimentally address the question "Is there any intrinsic advantage for work extraction given by the use of an entangled working medium?". By addressing work-extraction protocols based on a mechanism intimately linked to the paradigm of Maxwell's daemon, and implementing suitably designed multi-photon optical interferometers, we demonstrate experimentally the intrinsic advantages for such tasks provided by bipartite and genuine multipartite entanglement. We highlight the unique nature of such tests by comparing their performance to standard tests for the inseparability of multi-photon state resources. Our work contributes strongly to the ongoing efforts in establishing photonic systems as a platform for experiments for information thermodynamics.Thermodynamics is one of the pillars of physical, chemical and biological sciences [1]. It predicts and explains the occurrence and efficiency of complex chemical reactions and biological processes. In physics and engineering, the conduction of heat across a medium, the concept of the arrow of time [2,3], and the efficiency of motors are formulated in thermodynamic terms [4]. In information theory, the mantra that "information is physical" simply entails that, by being encoded in physical supports, information must obey the laws of thermodynamics [5]. Even more, the tightness of the link between information and thermodynamics can be appreciated from the thermodynamic interpretation of the landmark embodied by Landauers erasure principle [6], Jaynes principle of maximum entropy [7], or the information theoretical exorcism of Maxwell's demon operated by Charlie Bennett [8].More recently, it has been realized that thermodynamics can be used effectively to provide a new way of assessing and exploiting quantum dynamics, build super-efficient nano-and micro-engines that take advantage of quantum coherence, and assess information theory from the perspective of thermodynamic costs [9].In this context, the identification of the specific features of quantum systems that might influence their thermodynamic performance is still an open and controversial challenge. Quantum coherences are allegedly responsible for the possibility to extract work from a single heat bath [10]. In the weak-driving quantum regime, both discrete and continuoustime heat engine exhibit non-classical signatures enabling enhanced power outputs with respect to the relevant classical (i.e. stochastic) version of such machines [11].On the other hand, perfectly reversible work extraction from an ensemble of non-intera...

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Experimental achievement of the entanglement-assisted capacity for the depolarizing channel

Cited by 14 publications

References 28 publications

Practical Route to Entanglement-Assisted Communication Over Noisy Bosonic Channels

Practical Route to Entanglement-Assisted Communication Over Noisy Bosonic Channels

Experimental extractable work-based multipartite separability criteria

Experimental entanglement-enhanced work extraction based on a Maxwell’s demon

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