Qubits
The Topological Bet: Microsoft's Long Shot at a Sturdier Qubit
RafayelNearly every quantum computer in operation today shares a frustrating trait: the information in its qubits is fragile. A stray vibration, a wandering...
The Photon Path: Building a Quantum Computer Out of Light
Almost every quantum computer you read about stores its information in matter. Superconducting chips freeze tiny circuits to a hair above absolute zer...
The Rydberg Blockade: How Neutral Atoms Say No to Their Neighbors
Neutral-atom quantum computers have a curb-appeal problem. Rows of identical atoms held in laser tweezers look almost too tidy to compute anything. Th...
The Atom Menu: Why Trapped-Ion Makers Argue Over Which Element to Use
Before a trapped-ion quantum computer can hold a single qubit, someone has to pick which atom to trap. It sounds like a footnote, but it is one of the...
Dynamical Decoupling: The Pulse Trick That Keeps a Waiting Qubit Alive
Picture a quantum circuit as a factory floor where some machines are hammering away and others are standing idle, waiting for a part to arrive. In a c...
The Diamond Qubit: Quantum Computing Without the Deep Freeze
Nearly every quantum computer you read about shares one demanding requirement: brutal cold. Superconducting chips need dilution refrigerators that hov...
The Leakage Problem: When a Qubit Sneaks Out of Its Own Two Levels
The whole premise of a qubit is that it holds one bit of quantum information in two states, conventionally labeled 0 and 1. It is a tidy abstraction....
The Fluxonium Challenger: The Superconducting Qubit Gunning for the Transmon
Nearly every superconducting quantum computer you have heard of runs on the same basic building block: the transmon. IBM, Google, and Rigetti all stac...
The Erasure Trick: Making Qubit Errors Announce Themselves
Every quantum computer fights the same enemy: errors. Qubits drift, decay, and flip in ways that corrupt a calculation long before it finishes. The us...
The Hot Qubit Gambit: Running Quantum Chips Above a Kelvin
Ask why quantum computers are so hard to build and the answer usually starts with temperature. Superconducting and spin qubits typically operate aroun...
The Tantalum Surprise: How a Material Swap Stretched Qubit Lifetimes
For years the standard recipe for a superconducting qubit looked settled. You patterned thin films of aluminum and niobium on a silicon or sapphire ch...
The Silicon Spin Bet: Building Qubits on a Chip Fab Line
Walk into most quantum computing labs and the hardware barely resembles a computer chip. Trapped-ion machines use vacuum chambers and lasers. Supercon...
The Entangling Gate: Quantum Computing's Hardest Move
Ask an engineer which part of a quantum computer keeps them up at night, and the answer is rarely the qubits themselves. It is the operation that conn...
The Transmon Workhorse: Why Superconducting Circuits Dominate Quantum Computing
If you log into a quantum computer through a cloud service from IBM, Google, or Rigetti, odds are you are talking to a chip made of superconducting ci...