Synthesis of Quantum Antennas for Shaping Field Correlations

Mikhalychev, A.; Mogilevtsev, D.; Slepyan, G. Ya.; Karuseichyk, Ilya; Buchs, Gilles; Boïko, D. L.; Boag, Amir

doi:10.1103/physrevapplied.9.024021

Cited by 25 publications

(39 citation statements)

References 38 publications

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“…However, with increasing N the global maximum of the Fisher information is reached at t best < t max which is determined from Eq. (19). The switching from the high to the low value of t best is sharp.…”

Section: A Restoring Heisenberg Scaling For Arbitrary Timesmentioning

confidence: 93%

“…Notice that Eq. (19) generally gives a number of solutions corresponding to different extremums of the Fisher information. We illustrate this behavior in Fig.…”

Section: Measurement and Error Estimatementioning

confidence: 99%

“…From Eq. (19), one can obtain a simple estimate for the best time in the Zeno regime. Making an ansatz γ N (T, t) ≈ t 2 f (T, N ), one obtains t best ≈ (2f (T, N )) −1/2 .…”

Section: A Restoring Heisenberg Scaling For Arbitrary Timesmentioning

confidence: 99%

“…Using an exact solution for an ensemble of atoms interacting with the same bosonic dephasing reservoir, we show that for a class of super-Ohmic reservoir densities of states interference between reservoir bosonic modes arising due to spatial arrangements of atoms can suppress dephasing of the initial entangled state of the atomic ensemble in the limit of large number of atoms for any measurement time and temperature, and restore the Heisenberg limit. It is already known that such quantum-classical interference phenomena lead to a number of curious effects such as: precise directional emission of an absorbed photon by an atomic ensemble [16], superdirectional intensity distributions [17], non-reciprocity [18] and possibility to generate directional entangled state by quantum antennas [19]. The ability to partially preserve coherence and quantum correlations by non-Markovian collective dephasing for a spatially distributed atomic system in a Werner state has been recently demonstrated [13].…”

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confidence: 99%

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Restoring the Heisenberg limit via collective non-Markovian dephasing

et al. 2018

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In this work an exactly solvable model of N two-level systems interacting with a single bosonic dephasing reservoir is considered to unravel the role played by collective non-Markovian dephasing. We show that phase estimation with entangled states for this model can exceed the standard quantum limit and demonstrate Heisenberg scaling with the number of atoms for an arbitrary temperature. For a certain class of reservoir densities of states decoherence can be suppressed in the limit of large number of atoms and the Heisenberg limit can be restored for arbitrary interrogation times. We identify the second class of densities when the Heisenberg scaling can be restored for any finite interrogation time. We also find the third class of densities when the standard quantum limit can be exceeded only on the initial stage of dynamics in the Zeno-regime.

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Section: A Restoring Heisenberg Scaling For Arbitrary Timesmentioning

confidence: 93%

“…Notice that Eq. (19) generally gives a number of solutions corresponding to different extremums of the Fisher information. We illustrate this behavior in Fig.…”

Section: Measurement and Error Estimatementioning

confidence: 99%

“…From Eq. (19), one can obtain a simple estimate for the best time in the Zeno regime. Making an ansatz γ N (T, t) ≈ t 2 f (T, N ), one obtains t best ≈ (2f (T, N )) −1/2 .…”

Section: A Restoring Heisenberg Scaling For Arbitrary Timesmentioning

confidence: 99%

mentioning

confidence: 99%

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Restoring the Heisenberg limit via collective non-Markovian dephasing

et al. 2018

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“…The correlation function (29) is equal to the correlation function of resonance fluorescence in detail considered in [1]. An approximate relation for steady state reads    …”

Section: Radiation Properties Of Quantum Antennamentioning

confidence: 99%

Quantum Antenna as an Open System: Strong Antenna Coupling with Photonic Reservoir

Komarov

Slepyan

2018

Applied Sciences

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We proposed the general concept of quantum antenna in the strong coupling regime. It is based on the theory of open quantum systems. The antenna emission to the space is considered as an interaction with the thermal photonic reservoir. For modeling of the antenna dynamics is formulated a master equation with the correspondent Lindblad super-operators as the radiation terms. It is shown that strong coupling dramatically changes the radiation pattern of antenna. The total power pattern splits to three partial components; each corresponds to the spectral line of Mollow triplet. We analyzed the dependence of splitting from the length of antenna, shift of the phase, and Rabi-frequency. The predicted effect opens a way for implementation of multi-beam electrically tunable antennas, potentially useful in different nano-devices.

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Analysis and design of secure quantum communication systems utilizing electromagnetic Schrodinger coherent states

Mikki

Herde

2021

Quantum Engineering

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We develop a general mathematical formalism and computational method suitable for analyzing the performance of quantum communication systems utilizing coherent radiation states (Schrodinger states). The key motivation is to demonstrate how the analysis and design of quantum communication systems may benefit from the integration of the physical structure (here, the optical quantum coherent state) with the quantum signal processing aspects (here, quantum estimation and prediction theory). As an application, we show how the quantum-electromagnetic signature of optical radiation emitted by quantum antennas, the Schrodinger's coherent state structure, may be exploited to jointly design the transmitter and receiver of a K-ary digital communication link. We present a concrete example comprised of a quantum quadrature-amplitude modulation (QAM) system (with K = 64), including a complete description of the required general design principles developed from quantum mechanics and the quantum antenna's radiated coherent state structure. The simulation results illustrate improvement in spectral efficiency due to the use of K = 64 over smaller values of K. We also compare the quantum antenna-based link performance with classical QAM utilizing classical antenna-based communication systems and report superiority of the quantum link over the classical version. To provide for security protection, our system is equipped with a quantum encryption protocol for quantum key distribution, and a demonstration of the complete quantum QAM system with encryption is presented. The main message of the article is the fruitfulness of incorporating a multidisciplinary approach to our thinking about electromagnetic wireless systems through the joint deployment of electromagnetic, quantum, and communication theories in the design and development process of current and future advanced technologies.

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Synthesis of Quantum Antennas for Shaping Field Correlations

Cited by 25 publications

References 38 publications

Restoring the Heisenberg limit via collective non-Markovian dephasing

Restoring the Heisenberg limit via collective non-Markovian dephasing

Quantum Antenna as an Open System: Strong Antenna Coupling with Photonic Reservoir

Analysis and design of secure quantum communication systems utilizing electromagnetic Schrodinger coherent states

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