$Rigetti Computing (RGTI.US)$
Is quantum computing really feasible in reality?

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$IonQ Inc (IONQ.US)$
$Alphabet-C (GOOG.US)$
IonQ quantum computers and Google's Willow quantum chips are based on two different quantum computing technology architectures (ion traps and superconducting qubits), each with its own advantages and disadvantages. Here is a detailed comparison:
1. Technical Architecture
IonQ
Basic technology: based on ion traps, using lasers to control charged atomic ions (such as calcium ions or ytterbium ions).
Bit properties: ions are naturally occurring and do not need to be manufactured, hence high bit consistency.
Quantum bits are directly controlled by lasers, with high precision.
Connection method: fully connected architecture, any two qubits can be operated directly without the need for intermediate qubit transfer.
Google Willow
Basic technology: based on superconducting qubits, controlling the qubit state through microwave pulses.
Nature of qubits: Superconducting qubits are made of artificial materials, which may have manufacturing defects leading to poor consistency.
Correction techniques are needed in large quantities to reduce noise.
Connection method: Nearest-neighbor connectivity architecture, only adjacent quantum bits can interact directly.
Summary:
IonQ has significant advantages in qubit coherence and fully connected architecture.
Google Willow's superconducting qubits are suitable for large-scale integration, but they are complex to manufacture.
2. Number of quantum bits
IonQ
Supports up to about 30-40 effective quantum bits.
...

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