Sensing of Arbitrary-Frequency Fields Using a Quantum Mixer

Wang, Guoqing; Liu, Yixiang; Schloss, Jennifer; Alsid, Scott T.; Braje, Danielle; Cappellaro, Paola

doi:10.1103/physrevx.12.021061

Cited by 42 publications

(16 citation statements)

References 87 publications

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“…( 46) can be approximated by a typical Rabi frequency of atomic systems Ω R = 40 MHz, corresponding to a laser power P (ω) = 10 µW. For these parameters, the quantum-optical coherence time is t c = 5 ms, which is comparable to the duration of typical cold-atom experiments [109][110][111], but significantly shorter than quantum information storage times achieved with trapped ions [112].…”

Section: B Experimental Verificationmentioning

confidence: 99%

Unified Light-Matter Floquet Theory and its Application to Quantum Communication

Engelhardt¹,

Choudhury²,

Liu³

2022

Preprint

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Periodically-driven quantum systems can exhibit a plethora of intriguing non-equilibrium phenomena, that can be analyzed using Floquet theory. Naturally, Floquet theory is employed to describe the dynamics of atoms interacting with intense laser fields. However, this semiclassical analysis can not account for quantum-optical phenomena that rely on the quantized nature of light. In this paper, we take a significant step to go beyond the semiclassical description of atom-photon coupled systems by unifying Floquet theory with quantum optics using the framework of Full-Counting Statistics. This is achieved by introducing counting fields that keep track of the photonic dynamics. This formalism, which is dubbed "Photon-resolved Floquet theory" (PRFT), is based on two-point tomographic measurements, instead of the two-point projective measurements used in standard Full-Counting Statistics. Strikingly, the PRFT predicts the generation of macroscopic light-matter entanglement when atoms interact with multi-frequency electromagnetic fields, thereby leading to complete decoherence of the atomic subsystem in the basis of the Floquet states. This decoherence occurs rapidly in the optical frequency regime, but is negligible in the radio frequency regime. Intriguingly, time crystals can act as good quantum memories even in the optical frequency regime. Our results thus pave the way for the design of efficient quantum memories and quantum operations. Finally, employing the PRFT, we propose a quantum communication protocol that can significantly outperform the state-of-art few-photon protocols by two orders of magnitude or better. The PRFT potentially leads to new insights in various Floquet settings including spectroscopy, thermodynamics, quantum metrology, and quantum simulations.

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Section: B Experimental Verificationmentioning

confidence: 99%

Unified Light-Matter Floquet Theory and its Application to Quantum Communication

Engelhardt¹,

Choudhury²,

Liu³

2022

Preprint

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“…Furthermore, if the total electron spins belonging to the defect are not zero, the defect spin can be used as a solid-state qubit [21][22][23][24][25][26][27][28][29][30]. They are the basis of quantum computers [31], quantum memories and registers (with the assistance of the environmental nuclear spins) [32][33][34], and quantum sensors [35][36][37][38][39][40][41][42]. Optically active spin defects can also be used as the quantum light-matter interface, which is crucial for the establishment of quantum repeaters [43] in the longdistance quantum communication.…”

Section: Introductionmentioning

confidence: 99%

Anti-Stokes excitation of optically active point defects in semiconductor materials

Lin

Wang

et al. 2022

Mater. Quantum. Technol.

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Optically addressable point defects in semiconductor materials have been identiﬁed as promising single-photon sources and spin qubits in quantum information technologies. The traditional method of exploring the optical and spin properties of these defects is using a laser with a wavelength shorter than the point defects’ zero-phonon-line (ZPL) to Stokes exciting and detecting the Stokes photonluminescence (PL). On the other hand, anti-Stokes excitation with the pumping laser’s wavelength longer than the defects’ ZPL can also be used to investigate their optical and spin properties. The anti-Stokes excitation has shown many advantages and attracted great interest. Here, we provide a brief review of the anti-Stokes excitation of optically active point defects in semiconductor materials. The Stokes and anti-Stokes PL spectra of diﬀerent point defect systems in semiconductor materials are compared. We then discuss the main mechanisms of the anti-Stokes excitation of diﬀerent physical systems and conclude that the anti-Stokes excitation of the point defect system in the semiconductor is a single-photon absorption phonon-assisted process. Finally, we summarize some practical applications of anti-Stokes excitation, including laser cooling of semiconductor materials, high-sensitivity quantum thermometry, and enhancement of the readout signal contrast of the point defect spin states. The anti-Stokes excitation of point defects in semiconductors extends the boundary of quantum technologies.

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“…Broadly speaking, there are two options within the MF formalism: frequencies with (i) commensurate [30] and (ii) incommensurate [31] relationships. The formalism of incommensurate multi-frequency driving demands the introduction of a Fourier manifold for each additional drive [31], which has yielded useful application for 0-dimensional qubit frequency mixers [32]. However, this formalism and computation could be cumbersome for two dimensional systems and above.…”

Section: Introductionmentioning

confidence: 99%

Topological phase transition in commensurate multi-frequency Floquet Su-Schrieffer-Heeger model

Sam¹,

Lee²

2022

Preprint

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Recently, Floquet systems have attracted a great deal of interest as they offer unprecedented ability to engineer topological states through the tuning of an external time-periodic drive. Consequentially, seeking new driving protocols that allow for more exotic topological phases and transitions becomes imperative for the Floquet engineer. In this paper, we study the Su-Schrieffer-Heeger model driven by two time-dependent periodic sources with commensurate frequencies and an amplitude modulation. Imposing more than one driving frequency allows us to realize even more exotic topological phases resulting from new couplings appearing in the Fourier space representation. Moreover, we find an experimentally practical method for sweeping the system through a topological phase transition by varying the amplitude mixture of the commensurate sources. We employ the local Chern marker, a real space representation of the Chern number, to simulate topological phase diagrams of the two-drive Floquet Hamiltonian in a variety of driving cases.

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Sensing of Arbitrary-Frequency Fields Using a Quantum Mixer

Cited by 42 publications

References 87 publications

Unified Light-Matter Floquet Theory and its Application to Quantum Communication

Unified Light-Matter Floquet Theory and its Application to Quantum Communication

Anti-Stokes excitation of optically active point defects in semiconductor materials

Topological phase transition in commensurate multi-frequency Floquet Su-Schrieffer-Heeger model

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