# A Scalable Cryo-CMOS 2-to-20GHz Digitally Intensive Controller for 4×32 Frequency Multiplexed Spin in Qubits/Transmons in 22nm FinFET Technology for Quantum Computers

A Scalable Cryo-CMOS 2-to-20GHz Digitally Intensive Controller for 4×32 Frequency Multiplexed Spin in Qubits/Transmons in 22nm FinFET Technology for Quantum Computers

Patra, B.

van Dijk, J.P.G.

Subramanian, S.

Corna, A.

Xue, X.

Jeon, C.

Sheikh, F.

Juarez-Hernandez, E.

Esparza, B.P.

Rampurawala, H.

Carlton, B.

Samkharadze, N.

Ravikumar, S.

Nieva, C.

Kim, S.

Lee, H.J.

Sammak, A.

Scappucci, G.

Veldhorst, M.

Vandersypen, L.M.K.

Babaie, M.

Sebastiano, F.

Charbon, E.

Pellerano, S.

Quantum computers (QC), comprising qubits and a classical controller, can provide exponential speed-up in solving certain problems. Among solid-state qubits, transmons and spin-qubits are the most promising, operating ≪ 1K. A qubit can be implemented in a physical system with two distinct energy levels representing the |0⟩ and |1⟩ states, e.g. the up and down spin states of an electron. The qubit states can be manipulated with microwave pulses, whose frequency f matches the energy level spacing E = hf (Fig. 19.1.1). For transmons, f ∼6GHz, for spin qubits f ∼20GHz, with the desire to lower it in the future. Qubit operations can be represented as rotations in the Bloch sphere. The rotation axis is set by the phase of the microwave signal relative to the qubit phase, which must be tracked for coherent operations. The pulse amplitude and duration determine the rotation angle. A π-rotation is typically obtained using a 50ns Gaussian pulse for transmons and a 500ns rectangular pulse for spin qubits with powers of -60dBm and -45dBm, respectively.

SubjectCMOS integrated circuits

Electron energy levels

FinFET

Rotation

Classical controllers

Energy level spacings

Microwave signals

Physical systems

Pulse amplitude

Rectangular pulse

Rotation angles

Solid state qubits

Qubits

High Tech Systems & Materials

Industrial Innovation

http://resolver.tudelft.nl/uuid:b9c52cf3-05ee-4e6d-89d1-0ec2f5b9babc

DOI TNO identifier955325

9781728132044

0193-6530

IEEE International Solid-State Circuits Conference, ISSCC 2020, 16-20 February 2020, 304-306

Document typeconference paper

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