Benchmarking Noise and Dephasing in Emerging Electrical Materials for Quantum Technologies

Islam, Saurav; Shamim, Saquib; Ghosh, Arindam

doi:10.1002/adma.202109671

Cited by 12 publications

(6 citation statements)

References 510 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One approach is the incorporation of some polymer with the organic dyes, which can separate the chromophores and increase the coherent dynamics of these Rh-B chromophores. The longer coherence times are promising features in light harvesting, optoelectronics, lasing, and quantum computing. − …”

Section: Introductionmentioning

confidence: 99%

Enhanced Exciton Coherence Time and Correlation with Probability of Absorption of Classical and Entangled Light in Quantum-Confined Systems

Rani,

Goodson

2024

J. Phys. Chem. C

View full text Add to dashboard Cite

The study of dephasing time in a material by using timeresolved two-photon near-field scanning optical microscope (NSOM) with classical light has been of great interest due to its many applications. If a material shows longer coherence time between molecules and excitation pulse,it can contain information about the material for a longer time. On the contrary, the use of quantum light for studying the molecular structure has also been of great interest in many applications. In this study, a correlation between quantum coherence of the material and the probability of absorbing classical and quantum light has been shown. The dephasing time in rhodamine-B (Rh-B) chromophores doped in polystyrene nanospheres (PS-Rh) and bare Rh-B chromophores has been observed using time-resolved two-photon NSOM at room temperature. It has been observed that the quantum coherence on a single PS bead doped with Rh-B chromophores has a longer lifetime compared to the bare Rh-B chromophores. A possible reason for longer coherence time in PS-Rh nanospheres could be the isolation of Rh-B chromophores inside the PS nanospheres, which removes the heterogeneity and local environment effects and increases the interference between the laser pulse and superposition state. The interaction of these PS-Rh nanospheres and Rh-B chromophores with classical and entangled light has also been investigated using classical and entangled two-photon absorption spectroscopies, and the cross-sections have been calculated. It was observed that doped PS-Rh nanospheres show higher nonlinear optical properties than the Rh-B chromophores. In this study, it has been shown that, in addition to the transition dipole moment and detuning energy, classical and entangled two-photon crosssections are also being affected by the quantum coherence.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced Exciton Coherence Time and Correlation with Probability of Absorption of Classical and Entangled Light in Quantum-Confined Systems

Rani,

Goodson

2024

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…UCF, a consequence of quantum interference, are aperiodic, reproducible fluctuations of the conductance of magnitude ≈ e 2 /h in a system, observed when the sample length is comparable to the phase coherence length (l φ ) [27][28][29][30][31]. The magnitude of UCF is strongly influenced by the underlying symmetries of the system and has been used to probe the ground state symmetries in many materials [32][33][34][35][36][37][38][39][40]. Theory predicts that the magneticfield-induced topological phase transition from a Dirac semimetal to a Weyl semimetal will manifest as a reduction in UCF magnitude by √ 2 [26] as one breaks TRS.…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic and electric fields on universal conductance fluctuations in thin films of the Dirac semi-metal Cd3As2

Xiao¹,

Islam²,

Yanez³

et al. 2023

Preprint

View full text Add to dashboard Cite

Time-reversal invariance and inversion symmetry are responsible for the topological band structure in Dirac semimetals. These symmetries can be broken by applying an external magnetic or electric field, resulting in fundamental changes to the ground state Hamiltonian and a topological phase transition. We probe these changes via the magnetic-field dependence and gate voltage-dependence of universal conductance fluctuations in top-gated nanowires of the prototypical Dirac semimetal Cd3As2. As the magnetic field is increased beyond the phase-breaking field,we find a factor of √ 2 reduction in the magnitude of the universal conductance fluctuations, in agreement with numerical calculations that study the effect of broken time reversal symmetry in a 3D Dirac semimetal. In contrast, the magnitude of the fluctuations increases monotonically as the chemical potential is gated away from the charge neutrality point. This effect cannot be attributed to broken inversion symmetry, but can be explained by Fermi surface anisotropy. The concurrence between experimental data and theory in our study provides unequivocal evidence that universal conductance fluctuations are the dominant source of intrinsic transport fluctuations in mesoscopic Cd3As2 devices and offers a promising general methodology for probing the effects of broken symmetry in topological quantum materials.

show abstract

“…However, it may also obscure the signal in electronic devices and limit precision measurements. Electronic flicker noise originates from time-dependent resistance fluctuations that can be generated by various mechanisms, including charge trapping–detrapping and scattering of mobile charge carriers by defects and impurities with time-dependent scattering cross sections. ,,,,− Flicker noise is observed when a voltage difference or current bias is applied across a conductor, revealing the mentioned resistance fluctuations, though it can also be detected by temporal currents at thermal equilibrium. , …”

mentioning

confidence: 99%

“…Flicker noise, sometimes known as 1/ f noise due to its inverse dependence on frequency, is a ubiquitous phenomenon in nature. − The electronic version of flicker noise can be found in most electronic conductors or devices, ,,,,− down to single molecule conductors. − This noise plays a central role in both fundamental research and technology since it contains useful information on device structure, material properties, and electron transport mechanisms. However, it may also obscure the signal in electronic devices and limit precision measurements.…”

mentioning

confidence: 99%

Delta-T Flicker Noise Demonstrated with Molecular Junctions

Shein-Lumbroso,

Gerry,

Shastry

et al. 2024

Nano Lett.

View full text Add to dashboard Cite

Electronic flicker noise is recognized as the most abundant noise in electronic conductors, either as an unwanted contribution or as a source of information on electron transport mechanisms and material properties. This noise is typically observed when a voltage difference is applied across a conductor or current is flowing through it. Here, we identify an unknown type of electronic flicker noise that is found when a temperature difference is applied across a nanoscale conductor in the absence of a net charge current or voltage bias. The revealed delta-T flicker noise is demonstrated in molecular junctions and characterized using quantum transport theory. This noise is expected to arise in nanoscale electronic conductors subjected to unintentional temperature gradients, where it can be a performance-limiting factor. On the positive side, delta-T flicker noise can detect temperature differences across a large variety of nanoscale conductors, down to atomic-scale junctions with no special setup requirements.

show abstract

Benchmarking Noise and Dephasing in Emerging Electrical Materials for Quantum Technologies

Abstract: Figure 1. Schematic of coupling between the state vector ψ, control field 0 E and TLS of amplitude b , causing the state to randomly fluctuate between ± 0 E b , with a switching rate γ.

Cited by 12 publications

References 510 publications

Enhanced Exciton Coherence Time and Correlation with Probability of Absorption of Classical and Entangled Light in Quantum-Confined Systems

Enhanced Exciton Coherence Time and Correlation with Probability of Absorption of Classical and Entangled Light in Quantum-Confined Systems

Influence of magnetic and electric fields on universal conductance fluctuations in thin films of the Dirac semi-metal Cd3As2

Delta-T Flicker Noise Demonstrated with Molecular Junctions

Contact Info

Product

Resources

About