Remote Generation of Magnon Schrödinger Cat State via Magnon-Photon Entanglement

Sun, Feng-Xiao; Zheng, Shasha; Xiao, Y.; Gong, Qihuang; He, Qichun; Xia, Ke

doi:10.1103/physrevlett.127.087203

Cited by 106 publications

(41 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There are several other methods to generate cat states [266,274]. In the context of optomagnonic systems, Sun and colleagues [275] have suggested a method that does not require equilibrium magnon squeezing. Instead, they suggested a nonequilibrium two-mode squeezing between already generated magnon and photon coherent states.…”

Section: (B)mentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan

2022

Preprint

View full text Add to dashboard Cite

Spintronics and quantum information science are two promising candidates for innovating information processing technologies. The combination of these two fields enables us to build solid-state platforms for studying quantum phenomena and for realizing multi-functional quantum tasks. For a long time, however, the intersection of these two fields was limited due to the distinct properties of the classical magnetization, that is manipulated in spintronics, and quantum bits, that are utilized in quantum information science. This situation has changed significantly over the last few years because of the remarkable progress in coding and processing information using magnons. On the other hand, significant advances in understanding the entanglement of quasi-particles and in designing high-quality qubits and photonic cavities for quantum information processing provide physical platforms to integrate magnons with quantum systems. From these endeavours, the highly interdisciplinary field of quantum magnonics emerges, which combines spintronics, quantum optics and quantum information science. Here, we give an overview of the recent developments concerning the quantum states of magnons and their hybridization with mature quantum platforms. First, we review the basic concepts of magnons and quantum entanglement and discuss the generation and manipulation of quantum states of magnons, such as single-magnon states, squeezed states and quantum many-body states including Bose-Einstein condensation and the resulting spin superfluidity. We discuss how magnonic systems can be integrated and entangled with quantum platforms including cavity photons, superconducting qubits, nitrogen-vacancy centers, and phonons for coherent information transfer and collaborative information processing. The implications of these hybrid quantum systems for non-Hermitian physics and parity-time symmetry are highlighted, together with applications in quantum memories and high-precision measurements. Finally, we present an outlook on some of the challenges and opportunities in quantum magnonics.

show abstract

Section: (B)mentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In particular, the creation of optical cat states by photon subtraction on squeezed light has been demonstrated [21][22][23][24], which, however, only generates small-size cat states and moreover depends on single-photon resolved detection. In this situation, when taking into account that homodyne detection has become a relatively mature and high-efficiency technology, it is therefore interesting to generate large-size optical cat states via homodyne detection [25].…”

Section: Introductionmentioning

confidence: 99%

Remotely preparing optical Schrödinger cat states via homodyne detection in nondegenerate triple-photon spontaneous downconversion

Wei¹,

Tan²,

He³

2022

Quantum Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Optical downconversion is a key resource for generating nonclassical states. Very recently, direct nondegenerate triple-photon spontaneous downconversion (NTPSD) with bright photon triplets and strong third-order correlations has been demonstrated in a superconducting device [Phys. Rev. X 10, 011011 (2020)]. Besides, linear and nonlinear tripartite entanglement in this process have also been predicted [Phys. Rev. Lett 120, 043601 (2018); Phys. Rev. Lett. 125, 020502 (2020)]. In this paper, we consider the generation of nonclassical optical quantum superpositions and investigate nonlinear quantum steering effects in NTPSD. We find that large-size Schr¨odinger cat states of one downconverted mode can be achieved when the other two modes are subjected to homodyne detection. Also, a two-photon Bell entangled state can be generated when only one mode is homodyned. We further reveal that such ability of remote state steering originates from nonlinear quantum steerable correlations among the triplets. This is specifically embodied by the seeming violation of the Heisenberg uncertainty relation for the inferred variances of two noncommutating higher-order quadratures of downconverted modes, based on the outcomes of homodyne detection on the other mode, i.e., nonlinear quantum steering, compared to original Einstein-Podolsky-Rosen steering. Our results demonstrate non-Gaussian nonclassical features in NTPSD and would be useful for the fundamental tests of quantum physics and implementations of optical quantum technologies.

show abstract

“…[26,27] Cavity optomagnonics, which support both photon modes and magnon modes in ferrimagnetic crystal YIG, provide a platform for studying magnon-photon interaction. [6,7,22,23,25,[28][29][30][31][32][33][34][35][36][37][38][39] Such interaction has been explored to demonstrate Brillouin light scattering [21][22][23][24][25] and microwave-to-optics frequency conversion. [28,40] However, the interaction strength is much smaller than the decay rates of both optical photon and magnon modes, which limits the microwave-to-optics frequency conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Non‐Classical Correlations between Single Photons and Magnons

et al. 2022

View full text Add to dashboard Cite

A scheme is proposed to realize the non‐classical correlation between magnons and photons in a cavity optomagnonic system, which supports both photon modes and a magnon mode. Starting with the system being initially prepared in its ground state, two laser pulses successively drive corresponding optical mode. A two‐mode squeezing interaction between optical mode 1 and the magnon mode is created by the first pulse, which leads to a non‐classical correlation between photons and magnons. To verify this non‐classical correlation, the second pulse is utilized to transfer the magnon state to another optical mode, thus the correlated photon–photon pairs are generated out of the cavity. By discussing the violation of Cauchy–Schwarz inequality, based on numerical simulation, it is confirmed that non‐classical correlated photon–magnon pairs can be created in the weak coupling regime, which relaxes the requirements of experimental conditions. The result indicates that cavity optomagnonics can be a promising platform for studying magnon‐based quantum information processing.

show abstract

Remote Generation of Magnon Schrödinger Cat State via Magnon-Photon Entanglement

Cited by 106 publications

References 76 publications

Quantum magnonics: when magnon spintronics meets quantum information science

Quantum magnonics: when magnon spintronics meets quantum information science

Remotely preparing optical Schrödinger cat states via homodyne detection in nondegenerate triple-photon spontaneous downconversion

Non‐Classical Correlations between Single Photons and Magnons

Contact Info

Product

Resources

About