Near-Field Generation and Control of Ultrafast, Multipartite Entanglement for Quantum Nanoplasmonic Networks

Abstract

For a quantum Internet, one needs reliable sources of entangled particles that are compatible with measurement techniques enabling time-dependent, quantum error correction. Ideally, they will be operable at room temperature with a manageable decoherence versus generation time. To accomplish this, we theoretically establish a scalable, plasmonically based archetype that uses quantum dots (QD) as quantum emitters, known for relatively low decoherence rates near room temperature, that are excited using subdiffracted light from a near-field transducer (NFT). NFTs are a developing technology that allow rasterization across arrays of qubits and remarkably generate enough power to strongly drive energy transitions on the nanoscale. This eases the fabrication of QD media, while efficiently controlling picosecond-scale dynamic entanglement of a multiqubit system that approaches maximum fidelity, along with fluctuation between tripartite and bipartite entanglement. Our strategy radically increases the scalability and accessibility of quantum information devices while permitting fault-tolerant quantum computing using time-repetition algorithms.

Tunable phonon-driven magnon–magnon entanglement at room temperature

“…It plays a role in quantum information processing, opens a way towards intercept-resilient quantum communications, and enables increased sensitivity in quantum metrology. If it were possible to overcome the thermal noise and prepare robust entangled quantum states at ambient conditions, the corresponding implications for the future quantum devices would be significant [2][3][4][5][6][7][8][9].…”

Nanoheating and Nanoconduction with Near‐Field Plasmonics: Prospects for Harnessing the Moiré and Seebeck Effects in Ultrathin Films

“…[ 4 ] Such characteristics are highly desired for the fabrication of quantum networks which include logic gates, memories, and repeaters for error correction. [ 5,6 ] Furthermore, nanoheating due to plasmonics has notably been used within the next generation of data storage devices, [ 7 ] cancer treatments, [ 8 ] photovoltaic and solar cell technology, [ 9 ] and proposed for developing the field of phonon lasing. [ 10 ] These advancements are often attributed to the ability to focus and subdiffract light by coupling a photon mode to a plasmon mode, roughly an order of magnitude smaller in wavelength.…”

“…[4] Such characteristics are highly desired for the fabrication of quantum networks which include logic gates, memories, and repeaters for error correction. [5,6] Furthermore, nanoheating due to plasmonics has notably been used within the next generation of data storage devices, [7] cancer treatments, [8] photovoltaic and solar cell technology, [9] and pro-…”