Silicon Qubit Technology

equal1 is the first quantum company to exploit a commercial CMOS process for our qubits. With the recent advent of nanometer-scale geometries, commercial silicon processing has now reached “quantum readiness”. By using a commercial semiconductor process, equal1 takes advantage of unparalleled scalability of silicon processing. The qubit concept used by equal1 uses a fully depleted silicon of isolator technology, so the qubits are built in an undoped silicon film with the barriers between the quantum dots generated through the high dielectric constant gate oxide under the gate. This minimizes the barrier height and the barrier length to ensure fast qubit state change times. Because of the fast gates state switching times shorter coherence times can be used enabling use of natural isotope mixture in silicon and using moderate cryogenenic cooling to 4 K compared to the mK temperatures needed for other qubit technologies. As the driver and detector electronics are integrated on the same silicon die, high impedance interfaces can be used between the qubit and the driver/detector electronics ensuring that low power consumption is achievedWe are able to take advantage of the decades-long investment and innovation in silicon processing. This enables us to scale our qubits quickly and inexpensively to make useful quantum computing a reality. Our solution uses a fully-depleted silicon-on-insulator process (FD-SOI) to form our quantum dots creating the qubits.

 

Figure 1: Quantum Dot Double V (QEC220) (Side View)

 

Figure 2: Quantum Dot Double V (QEC220) (Top View)