Error rate of RSFQ circuits: theory

Herr, Q.P.; Feldman, M.J.

doi:10.1109/77.621786

Cited by 27 publications

(19 citation statements)

References 5 publications

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“…The asymmetry of the comparator response is shown in Fig 3a and the periodicity of the QOS is shown in Fig 3b. The actual value of the current that we couple into the QOS from the 6mΦo is on the order of 600nA. This value is an order of magnitude smaller than the value obtained from approximation (4). The reason for this is not known at the moment.…”

Section: Methodsmentioning

confidence: 74%

“…The current design that tested is much more complicated due to the asymmetry of the comparator and the dynamics of the QOS. It is clear that the approximations in (4) are not sufficient to resolve this improvement.…”

Section: Methodsmentioning

confidence: 99%

“…The analytic theory [3] assumes a shunted comparator. There is also Fokker-Planck theory and experimental evidence of the temperature dependance of the switching probablity for a shunted comparator in [4,5]. Currently there is no experimental evidence or theoretical prediction for the sensitivity of the unshunted comparator at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Currently there is no experimental evidence or theoretical prediction for the sensitivity of the unshunted comparator at lower temperatures. Neither [3] nor [4] is an adequate treatment of with this device as explained in [2]. The question of whether quantum noise would give a lower bound to the sensitivity has been discussed for the case of a shunted balanced SFQ comparator [3] and for the unshunted case [2].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Unshunted QOS Comparator for Qubit Readout

Ohki

Wulf

Feldman

et al. 2006

J. Phys.: Conf. Ser.

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State measurements of flux-based superconducting quantum bits (qubits) require the sensitive discrimination of small differences of magnetic flux, with measurement times short compared to the timescales of coherent quantum mechanical behaviour. The single-fluxquantum (SFQ) superconducting comparator may be the best device for this purpose. An SFQ comparator design using a quasi-one-junction SQUID (QOS) acting as the comparator junction has two advantages over earlier designs-increased sensitivity and the possibility to eliminate shunt resistors. Here we report the first measurements of the sensitivity of an unshunted QOS comparator. The gray zone of this device at 4.2K is 6 mΦo.

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Section: Methodsmentioning

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unshunted QOS Comparator for Qubit Readout

Ohki

Wulf

Feldman

et al. 2006

J. Phys.: Conf. Ser.

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“…6. The simulated BER can be fitted by the error function [9] in the low probability region. The experimental BER values were higher than the calculated values.…”

Section: Amentioning

confidence: 99%

Error Detection Method for RSFQ Voltage Multipliers Using a SQUID Detector

Hirayama

Maezawa

Suzuki

et al. 2005

IEEE Trans. Appl. Supercond.

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The voltage multiplier (VM) is a principal component in high-precision digital-to-analog (D/A) converters based on rapid single flux quantum (RSFQ) circuits. Experimental confirmation of correct operation of the VM is important to guarantee the accuracy of the D/A converter. In this study, a circuit for direct comparison of the output voltages of VMs was designed and demonstrated. An on-chip SQUID sensor was utilized to detect the VM errors. Bit error rates of a single-stage VM were successfully measured down to 10 12 in the constant-voltage regions. A method of detecting errors during transients was also proposed and carried out. Index Terms-D/A converter, flux quantum, Josephson junction, voltage multiplier, voltage standards.

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Digital operation range of a RSFQ toggle flipflop

Benzing¹,

Jutzi²

1997

Cryogenics

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Error rate of RSFQ circuits: theory

Cited by 27 publications

References 5 publications

Unshunted QOS Comparator for Qubit Readout

Unshunted QOS Comparator for Qubit Readout

Error Detection Method for RSFQ Voltage Multipliers Using a SQUID Detector

Digital operation range of a RSFQ toggle flipflop

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