Cryogenic memory technologies

Alam, Shamiul; Hossain, Md. Shafayat; Srinivasa, Srivatsa; Aziz, Ahmedullah

doi:10.1038/s41928-023-00930-2

“…This importance is exceptionally accentuated in the current era where quantum computers are becoming a reality, facilitated by the use of dilution refrigerators that can achieve temperatures approaching absolute zero. Therefore, accurate temperature monitoring is critical to maintain the property of a material (e.g., quantum state, superconducting state), optimize performance, and prevent any deviation that may lead to the loss of its highly sought‐after property [4–6] …”

Section: Methodsmentioning

confidence: 99%

“…The significance of monitoring temperature becomes increasingly crucial in cutting-edge technologies such as superconductors, spintronics, quantum information processing, and quantum magneto-optical memories. In these domains, temperature assumes a critical role in information retention, particularly at ultra-low temperatures below 10 K. [4][5][6] This importance is exceptionally accentuated in the current era where quantum computers are becoming a reality, facilitated by the use of dilution refrigerators that can achieve temperatures approaching absolute zero. Therefore, accurate temperature monitoring is critical to maintain the property of a material (e.g., quantum state, superconducting state), optimize performance, and prevent any deviation that may lead to the loss of its highly sought-after property.…”

mentioning

confidence: 99%

“…Therefore, accurate temperature monitoring is critical to maintain the property of a material (e.g., quantum state, superconducting state), optimize performance, and prevent any deviation that may lead to the loss of its highly sought-after property. [4][5][6] In recent years, luminescence thermometry has been successfully demonstrated as a highly sensitive remote technique to probe temperature. [1][2][3] Several concepts have been employed to target different probing strategies, such as band-shift, [7][8][9] lifetime, [10][11][12] energy-transfer-based ratiometric thermometry, [13][14][15][16][17][18][19][20][21][22][23][24][25] and single-band, [26][27][28][29][30][31][32][33][34][35][36][37][38] each approach having its own advantages/disadvantages.…”

mentioning

confidence: 99%

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Toward Magneto‐Optical Cryogenic Thermometers with High Sensitivity: A Magnetic Circular Dichroism Based Thermometric Approach

Gálico,

Murugesu

2023

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Remote temperature probing at the cryogenic range is of utmost importance for the advancement of future quantum technologies. Despite the notable achievements in luminescent thermometers, accurately measuring temperatures below 10 K remains a challenging endeavor. In this study, we propose a novel magneto‐optical thermometric approach based on the magnetic‐circular dichroism (MCD) technique, which offers unprecedented capabilities for meticulous temperature variation analysis at cryogenic temperatures. The inherent temperature sensitivity of the MCD C‐term, in conjunction with both positive and negative signals, enables highly sensitive magneto‐optical temperature probing. Additionally, a groundbreaking relative thermal sensitivity value of 95.3% K‐1 at 2.54 K can be achieved using a mononuclear lanthanide complex, [[Ho(acac)3(phen)], in the presence of a 0.25 T applied magnetic field and using a combination of multiparametric thermal read‐out with multiple regression. These results unequivocally demonstrate the viability and effectiveness of our methodology for cryogenic temperature sensing.

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“…Novel approaches are needed for building a VLSIcompetitive SC electronics. Several strategies for making dense SC RAM have been suggested recently [7,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Word and bit line operation of a 1x1 μm2 superconducting vortex-based memory

Golod

¹

,

Morlet-Decarnin

²

,

Krasnov

³

2023

Preprint

0

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The lack of dense random access memory is one of the main bottlenecks for the creation of a digital superconducting computer. In this work we study experimentally vortex-based superconducting memory cells. Three main results are obtained. First, we test scalability and demonstrate that the cells can be straightforwardly miniaturized to submicron sizes. Second, we emphasize the importance of conscious geometrical engineering. In the studied devices we introduce an asymmetric easy track for vortex motion and show that it enables a controllable manipulation of vortex states. Finally, we perform a detailed analysis of word and bit line operation of a 1×1 μm2 cell. High-endurance, nonvolatile operation at zero magnetic field is reported. Remarkably, we observe that the combined word and bit line threshold current is significantly reduced compared to the bare word-line operation. This could greatly improve the selectivity of individual cell addressing in a multibit RAM. The achieved one square micron area is an important milestone and a significant step forward towards creation of a dense cryogenic memory.

show abstract

“…Therefore, accurate temperature monitoring is critical to maintain the property of a material (e.g., quantum state, superconducting state), optimize performance, and prevent any deviation that may lead to the loss of its highly sought-after property. [4][5][6] In recent years, luminescence thermometry has been successfully demonstrated as a highly sensitive remote technique to probe temperature. [1][2][3] Several concepts have been employed to target different probing strategies, such as band-shift, [7][8][9] lifetime, [10][11][12] energy-transfer-based ratiometric thermometry, [13][14][15][16][17][18][19][20][21][22][23][24][25] and single-band, [26][27][28][29][30][31][32][33][34][35][36][37][38] each approach having its own advantages/disadvantages.…”

mentioning

confidence: 99%

Toward Magneto‐Optical Cryogenic Thermometers with High Sensitivity: A Magnetic Circular Dichroism Based Thermometric Approach

Gálico,

Murugesu

2023

Angewandte Chemie

0

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Remote temperature probing at the cryogenic range is of utmost importance for the advancement of future quantum technologies. Despite the notable achievements in luminescent thermometers, accurately measuring temperatures below 10 K remains a challenging endeavor. In this study, we propose a novel magneto‐optical thermometric approach based on the magnetic‐circular dichroism (MCD) technique, which offers unprecedented capabilities for meticulous temperature variation analysis at cryogenic temperatures. The inherent temperature sensitivity of the MCD C‐term, in conjunction with both positive and negative signals, enables highly sensitive magneto‐optical temperature probing. Additionally, a groundbreaking relative thermal sensitivity value of 95.3% K‐1 at 2.54 K can be achieved using a mononuclear lanthanide complex, [[Ho(acac)3(phen)], in the presence of a 0.25 T applied magnetic field and using a combination of multiparametric thermal read‐out with multiple regression. These results unequivocally demonstrate the viability and effectiveness of our methodology for cryogenic temperature sensing.

show abstract

Cryogenic memory technologies

Cited by 37 publications

References 128 publications

Toward Magneto‐Optical Cryogenic Thermometers with High Sensitivity: A Magnetic Circular Dichroism Based Thermometric Approach

Toward Magneto‐Optical Cryogenic Thermometers with High Sensitivity: A Magnetic Circular Dichroism Based Thermometric Approach

Word and bit line operation of a 1x1 μm2 superconducting vortex-based memory

Toward Magneto‐Optical Cryogenic Thermometers with High Sensitivity: A Magnetic Circular Dichroism Based Thermometric Approach

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