Designed for quantum physics, the QDAC series of products are high-precision low-noise computer-controlled voltage generators for DC and intermediate-frequency control of quantum electronics and quantum computer qubits. In addition to their precise and stable voltage output, QDACs can measure output currents – for example, to detect leaking gates or shorted bonding wires. QDACs have 24-channels and thus offer a cost-effective way to gain many high-quality D/A converter channels.

Precision Voltage

QDAC is a high-precision, 25-bit resolution, ultra-low-noise computer-controlled DAC with 24 voltage channel generators operating at a sample rate of 1MS/s. It is designed for DC and intermediate-frequency control of quantum devices, including, for example, gate electrodes and flux bias coils in qubits. It is also a very versatile instrument that can be used for many other purposes.

Fast Scan of
the Gate Space

Performs fast multi-dimensional gate voltage sweeps with a 1 MS/s output rate.

Complete and
Scalable Solution

Multiple OPX+ and QDAC units can be stacked and synchronized to operate as one advanced quantum control system for an QPU size DC to 400 MHz.

Key Features

  • Ultra-low noise and ultra stable 24-channel voltage source
  • Unique low pass filter with 3 ranges that can be switched between with minimal transients: cut-off 300 KHz, cut-off 10 KHz and cut-off 10 Hz
  • 25 bit resolution in DC mode (10 Hz cut-off), 20 bit in medium bandwidth mode (10 kHz cut-off) and in high bandwidth (fast) mode (300 kHz cut-off)
  • One million samples per second per chanel
  • Each channel has multiple standard waveform generators and an arbitrary waveform generator
  • Individual high resolution low-frequency current sensors on every channel, measuring current simultaneously on all channels
  • Advanced triggering and synchronization functions between channels with sub-microsecond precision


Multiple Waveforms

Each of the 24-channels has five voltage generators working in parallel: one for DC, a sine, triangle and square wave generator, and an arbitrary waveform generator (1 million points/second) 

Built-in Sensitive Current Sensors

Each channel includes a DC current sensor with a resolution down to a few tens of pA, typically used for gate leakage detection and with sample rates up to 3 kHz

Ultra Stable Voltage Source

Low noise floor (<20 nV/√Hz), ensuring reliable qubit operation points

Reduces Experiment Setup Costs

Built-in function generators (including AWG) and current sensors reduce the need for additional instruments

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