Measurement log | QuantumCore nanofab tracker

Pick a step to read the tooling, chemicals and procedure straight from the SOP.·4-inch Si → NbTiN → patterning → 3×3 blocks → measurement

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33 wafers · 6 blocks · 24 cooldowns

measurement log

Cryogenic device measurements

One entry per cooldown, transcribed from the measurement workbook (Oct 2025 – Aug 2026).

sessions

with gain

dead chips

best gain

20 dB

fridges

searchoutcomefridge

24 of 24 sessions

Partial / features onlySep 28, 2026- 17nm thick, 120mm long TWPA -17nm thick, 50 ohm straight line Both films are made with 200 nm thick a-Si but designed for 100 nmWH-B3-20G3-12

fridge: ARS
sample holder: SH5x14_2 SH5x14_3
station: —
logbook: 20260930
thickness: 17 nm
line length: 120 mm
stopband: —
gain: —

runsARS_firstcooldown_WH_B3_20G3

Awesome results, stop band near 14.5 GHz. Clear gain seen near 25-30 dB at certain frequencies. Pumping of the cryostat compressor was noticed to move the TWPA transmission up and down with an unknown cause. This was not noticed with the through line chip

blocks

Partial / features onlySep 21, 202617nm-thick and 100mm-long(WH-B3-20G3-11) and 17nm-thick and 120mm-long(WH-B3-20G3-12). Both chips have 200nm-thick a-Si and designed for nm-thick film.WH-B3-20G3-11WH-B3-20G3-12

fridge: ZPC1
sample holder: SH5x14_1(WH-B3-20G3-11) SH5x14_2(WH-B3-20G3-12)
station: —
logbook: WH_B3_20G3_11and12_zpc1_20260921
thickness: 17 nm
line length: 100 / 120 mm
stopband: 14.5 GHz
gain: —

runsWH_B3_20G3_11and12_zpc1_1_20260921

Both devices have have smooth transmission with a stopband ~14.5GHz. For both devices We see a clear gain profile by subtacting transmission w/o pump however the 0 gain level is shifted by ~-20dB due to attenuation of the signal when the pump is on.

blocks

Partial / features onlySep 15, 202617nm, 100mm, from old batch deposited 02112026W0D-B1-20G2U4

fridge: He Dewar
sample holder: SH3
station: —
logbook: 20260915
thickness: 17 nm
line length: 100 mm
stopband: —
gain: —

runsRAC_dewar_W0D_B2_20GU4_17nm_100mm

Stop-band location replicates ZPC1 measurement. Sensible pump sweep results with gain ~ 5 dB. TDR suggests high impedance and loss

blocks

Partial / features onlySep 4, 2026W0D-B2-20G0U4-11 is 17nm-thick and 100mm-long device from the old batch and old design with 10Ohm stripline. WG-B2-8G1-31 is 8nm-thick and 20mm-long device from the new batch but old design.WG-B2-8G1-31W0D-B2-20G0U4-11

fridge: ZPC1
sample holder: SH3(W0D-B2-20G0U4-11) SH4(WG-B2-8G1-31)
station: Measurement laptop
logbook: WG_B2_8G1_31_and_W0D_B2_20G0U4_zpc1_20260904
thickness: 17 nm
line length: 20 / 100 mm
stopband: 10.2 GHz
gain: —

runsWG_B2_8G1_31_and_W0D_B2_20G0U4_11_zpc1_1_20260904 · WG_B2_8G1_31_and_W0D_B2_20G0U4_11_zpc1_2_20260909

WG-B2-8G1-31 has bad transmission with high losses. W0D-B2-20G0U4-11 has a good transmission with a stopband ~10.2GHz. We see a clear gain profile by subtacting transmission w/o pump however the 0 gain level is shifted ~20dB down.

blocks

Partial / features onlySep 1, 202617nm, 50mm, from old batch deposited 02112026W0D-B1-20G2U4

fridge: RAC
sample holder: RAC
station: —
logbook: 20260901.pdf
thickness: 17 nm
line length: 50 mm
stopband: —
gain: —

runsRAC_17nm_50mm_W0D-B1-20G2

Remeasure of working device. Results were replicated. TDR was done and we saw very high impedance and loss

blocks

Partial / features onlyAug 27, 2026WG-B2-8G1-22 (8nm-thick and 100mm-long, 21 supercells) and WF-2D-20G2-? (20nm-thick and 100mm-long)WG-B2-8G1-22WF-2D-20G2-??

fridge: ZPC1
sample holder: SH3 (WG-B2-8G1-22), SH4 (WF-2D-20G2-??)
station: Measurement laptop
logbook: WG_B2_8G1_and_WF_2D_20G2_zpc1_20260827
thickness: 8 nm
line length: 100 mm
stopband: 4 GHz
gain: —

runsWG_B2_8G1_and_WF_2D_20G2_zpc1_1_20260827

Both devices have bad transmission. The transmission in WG-B2-8G1-22 has some stopband-looking features and high losses from 4GHz to 6GHz similar to WG-B2-8G1-21. The transmission in WF-2D-20G2-?? is lossy without pronounced features. For both devices we don't see a dependence of gain on pump frequency.

blocks

Dead chipAug 25, 20268nm, 100mm, 19 cells/scWG-B2-8G1

fridge: RAC
sample holder: RAC
station: —
logbook: 20260825.pdf
thickness: 8 nm
line length: 100 mm
stopband: —
gain: —

runsRAC_8nm_100mm_WG_B2_8G1

Dead chip, calibrated TDR results show a short very close to the beginning of the line, although the results are slightly asymmetrical for Port 1 and Port 2

blocks

Dead chipAug 11, 20268nm, 50mm, 19 cells/scWG-B2-8G1

fridge: RAC
sample holder: RAC
station: —
logbook: 20260811.pdf
thickness: 8 nm
line length: 50 mm
stopband: —
gain: —

runsRAC_8nm_50mm_19

Dead chip, uncalibrated TDR results suggest a short very close to the beginning of the line

blocks

Gain observedAug 9, 2026WG-B2-8G1-21 (8nm-thick and 50mm-long) and WF-2D-20G2 (20nm-thick and 50mm-long)WG-B2-8G1-21WF-2D-20G2-??

fridge: ZPC1
sample holder: SH3 (WG-B2-8G1-21), SH4 (WF-2D-20G2-??)
station: Measurement laptop
logbook: WG_B2_8G1_and_WF_2D_20G2_zpc1_20260809
thickness: 8 nm
line length: 50 mm
stopband: 7.8 GHz
gain: 20 dB

runsWG_B2_8G1_and_WF_2D_20G2_zpc1_1_20260809 · WG_B2_8G1_and_WF_2D_20G2_zpc1_2_20260816

WF-2D-20G2-?? device transmisson doesn't show a stopband but we see a 20dB gain for signal band with a stopband-looking feature ~7.8GHz. We see a jump in transmission power level for a weak pump tone signal. WG-B2-8G1-21 device has bad transmission with high losses from 4GHz to 6GHz. Both devices demonstrate 4WM processes.

blocks

Partial / features onlyJul 24, 202617nm, 50mm, from old batch deposited 02112026W0D-B1-20G1

fridge: RAC
sample holder: RAC
station: —
logbook: 20260724.pdf
thickness: 17 nm
line length: 50 mm
stopband: 10.3 GHz
gain: —

runsRAC_17nm_50mm_old

Good results, stopband near 10.3 GHz

blocks

Gain observedJul 20, 202620-nm thick, 50mm-long devices measuered on 6/5/2026W0C-B2-20G1U1-32

fridge: ZPC1
sample holder: SH1
station: Measurement laptop
logbook: QC_20nm_50mm_ZPC1_new_setup_20260720
thickness: 20 nm
line length: 50 mm
stopband: —
gain: 20 dB

runs20nm_50mm_zpc1_new_setup_1_20260720 · 20nm_50mm_zpc1_new_setup_Temp_2_20260731

W0C-B2-20G1U1-32 is connected to a new setup that filters out idler and pump band. We observe a 20dB gain. We observe a jump in power level of the device's transmission after applying a weak pump tone. Also, we see a similar jump for the temperature dependence between 445mK and 1.57K.

blocks

Dead chipJul 15, 202617nm, 150mmW0A-B1-20G2

fridge: RAC
sample holder: RAC
station: —
logbook: 20260715.pdf
thickness: 17 nm
line length: 150 mm
stopband: —
gain: —

runsN/A

Dead chip

blocks

Gain observedJun 24, 2026One is 20-nm thick, 50mm-long devices measuered on 4/17/2026 and 6/5/2026. Second is 17-nm thick, 175mm-long (W0A-B1-20G1U2-11)W0C-B2-20G1U1-21W0A-B1-20G1U2-11

fridge: ZPC1
sample holder: SH3, Alex's SH
station: Measurement laptop
logbook: QC_17nm_175mm_and_20nm_50mm_ZPC1_20260624
thickness: 20 nm
line length: 50 / 175 mm
stopband: —
gain: —

runs17nm_175mm_and_20nm_50mm_zpc1_1_20260624 · 17nm_175mm_and_20nm_50mm_zpc1_2_20260629

W0A-B1-20G1U2-11 device's transmission shows high losses indicating either short or open circuit. Old 20nm-thick device is connected to a new setup that filter out idler and pump bandwidth. We observe a jump in power level of the device's transmission after applying a weak pump tone (similar to what we see in 6/5/2026). Thus, the gain is either <10dB if we subtract transmission after the jump or 25dB if we subtract unpumped transmission.

blocks

Dead chipJun 13, 2026One is 20-nm thick, 50mm-long devices measuered on 4/17/2026 and 6/5/2026. Second is 17-nm thick, 50mm-long (W0A-B1-20G1U2-31)W0C-B2-20G1U1-21W0A-B1-20G1U2-31

fridge: ZPC2
sample holder: SH3, Alex's SH
station: Measurement laptop
logbook: QC_17nm_50mm_ZPC2_20260613
thickness: 20 nm
line length: 50 mm
stopband: —
gain: —

runs50mm_17nm_zpc2_1_20260613

W0A-B1-20G1U2-31 device has bad transmission indicating either short or open circuit. Old 20nm-thick device confirmed results observed in 6/5/2026

blocks

Gain observedJun 10, 202620-nm thick, 100mm-long devices from the same butch as from 4/17/2026W0C-B2-20G1U1-31

fridge: ZPC2
sample holder: SH3
station: Measurement laptop
logbook: QC_20nm_100mm_ZPC2_20260610
thickness: 20 nm
line length: 100 mm
stopband: 10.5 GHz
gain: 15 dB

runs100mm_20nm_1_20260610 · 100mm_20nm_3_20260611

Device is from the same batch as the one where we observed 15dB of gain. Transmission shows high losses with a stopband-looking feature ~10.5GHz. We also see not frequency dependent gain for random frequency ranges.

blocks

Gain observedJun 5, 2026Two 20-nm thick, 50mm-long devices. One was measured on 4/17/2026 and the other is from the same batch.W0C-B2-20G1U1-21W0C-B2-20G1U1-32

fridge: ZPC2
sample holder: SH1, Alex's SH
station: Measurement laptop
logbook: QC_20nm_50mm_ZPC2_20260605
thickness: 20 nm
line length: 50 mm
stopband: 10.5 GHz
gain: 15 dB

runs20260605

Device in Alex's SH was measured on 4/17/2026. Device in SH1 was measured in RAC's probe. For both devices we see a stopband ~10.5GHz and ~10dB of gain in the range 4to8GHz and ~15dB of gain in the range 6 to 8 GHz. Device in Alex's SH has a weired transmission with jumps in power until we apply a weak random pump tone.

blocks

Partial / features onlyMay 1, 202620-nm thick, 50mm-, 100mm-, 150mm- and 175mm-long devices. New design without long 10Ohm stripline.W0C-B3-20G1U2-??W0C-B3-20G1U2-??W0C-B3-20G1U2-??W0C-B3-20G1U2-??W0C-B3-20G1U2-??

fridge: ZPC1, ZPC2
sample holder: Alex's SH, RAC's SH, SH3
station: Measurement laptop
logbook: QC_20nm_175_100mm_ZPC1_20260501
thickness: 20 nm
line length: 50 / 100 / 150 / 175 mm
stopband: —
gain: —

runs20nm_100mm_zpc1_newDes_1_20260507 · 20nm_150mm_zpc1_newDes_1_20260515

A few cooldowns in different fridges and setups. Device transmissions have ripples and high losses indicating either short or open cicuit.

blocks

Partial / features onlyApr 17, 202620-nm thick, 50mm-long deviceW0C-B2-20G1U1-21

fridge: ZPC2
sample holder: Alex's SH
station: Measurement laptop
logbook: QC20nm50mmTWPA_ZPC2_20260417
thickness: 20 nm
line length: 50 mm
stopband: 10.5 GHz
gain: —

runs20nm_50mm_zpc2_2_20260417

Device has a stopband ~10.5GHz and show a strong nonlinearity. We don't observe a gain. Possible issue is that pumping line is too attenuated.

blocks

Partial / features onlyApr 13, 202617-nm thick, 50mm-long deviceW0D-B1-20G0U3-11

fridge: ZPC1
sample holder: SH3
station: Measurement laptop
logbook: QC17nm50mmTWPA_ZPC1_new_setup_20260413
thickness: 17 nm
line length: 50 mm
stopband: —
gain: —

runs17nm_50mm_dpx_setup_20260413 · 17nm_50mm_dpx_setup_2_20260414 · 17nm_50mm_dpx_setup_3_20260420

Device from the 3/22/2026 experiment is connected to a new setup that filters out idler and pump band. We observed a small gain but no improvement comparing with a simple setup.

blocks

Partial / features onlyMar 22, 202617-nm thick, 50mm-long deviceW0D-B1-20G0U3-11

fridge: ZPC1
sample holder: SH3
station: Whistler PC 3
logbook: QC_17nm_50mm_TWPA_ZPC1_20260322
thickness: 17 nm
line length: 50 mm
stopband: 8.6 GHz
gain: —

runs50mm_17nm_QC_2_20260322 · 50mm_17nm_QC_3_20260323 · 50mm_17nm_QC_4_20260325 · 50mm_17nm_QC_5_20260329

Device has a stopband ~8.6GHz and shows a small gain and 4WM frequency conversion.

blocks

Partial / features onlyFeb 23, 2026Two 8nm-thick, 20mm-long device is exposed with eBeam. One is measured on 12/17/2025 and the other is from the same batch.?-?-?-?

fridge: Tremblant
sample holder: Vadiraj's SH (old 20mm-long device), SH1 (new 20mm-long device)
station: Whistler PC
logbook: QC_8nm_TWPA_new_setup
thickness: 8 nm
line length: 20 mm
stopband: 6 GHz
gain: —

runsQC_RT_setup_test_20260219 · QC20_2_new_setup_1_20260224

20mm-long device from 12/17/2025 is connected to a new setup that filters out signal band. Observed a small gain and frequency connection. Transmission of the new 20mm-long device has a stopband 6GHz and ripples. Device shows a small gain and 4WM frequency conversion.

Partial / features onlyJan 7, 2026Two 8nm-thick, 10mm-long device is exposed with MLA with narrow and wide stubs.?-?-?-?

fridge: Tremblant
sample holder: SH1 and Alex's SH.
station: Whistler PC
logbook: QC_10_MLA_20260107
thickness: 8 nm
line length: 10 mm
stopband: —
gain: —

runsQC10_3_1_20260107

We did two cooldowns. Nothing interesting except "narrow" device had some stop-band looking featuer ~11.5GHz. Both devices had big ripples.

Partial / features onlyDec 17, 20258nm-thick, 20mm- and 10mm-long. 10mm-long device is exposed with MLA and had wrong connection inside the fridge.?-?-?-?

fridge: Tremblant
sample holder: 20mm-long device is in Vadiraj's SH
station: Whistler PC
logbook: QC_20_EB_and_10_MLA_20251217
thickness: 8 nm
line length: 10 / 20 mm
stopband: 6 GHz
gain: —

runsQC20_2_1_20251217 · QC20_2_2_20251219 · QC20_2_3_20251223 · QC20_2_4_20251230

20mm-device has a stopband at 6GHz. It shows a small gain and 4WM frequency conversion.

Partial / features onlyOct 27, 202535nm-thick, 10mm- and 100mm-long?-?-?-?

fridge: Tremblant
sample holder: 100mm-long device is in Vadiraj's SH. 10mm-long device is in SH1.
station: Whistler PC
logbook: QC_10_and_100_20251027
thickness: 35 nm
line length: 10 / 100 mm
stopband: —
gain: —

runsQC10_1_1_20251027 · QC10_1_2_20251029 · QC10_1_3_20251031 · QC10_1_4_20251104 · QC10_1_5_20251107 · QC10_1_6_20251108 · QC10_1_7_20251111

10mm-long device doesn't have a stopband but we see some pump frequency dependence and gain. Also, we see 4WM conversion. 100mm-long device doesn't show pump frequency dependence and a stopband.

coverage

Which blocks have cooldown data

measured

no cooldown logged

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