qubits
The Benchmark Wars: Why Quantum Computers Can't Agree on a Yardstick
RafayelAsk a quantum computing company how good its machine is and you will get a number. The trouble is that no two companies quote the same number. One bra...
The Topological Bet: Microsoft's Long Shot at a Sturdier Qubit
Nearly 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 Vacuum Trap: Why Atom and Ion Quantum Computers Chase Emptier-Than-Space Chambers
Every quantum computer needs to keep the outside world away from its qubits. Superconducting chips do it with cold, sealing themselves inside a diluti...
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 Quantum Interconnect: Splicing Chips Into One Bigger Machine
There is a ceiling on how big a single quantum chip can get. Fabrication yield drops as you cram more qubits onto one piece of silicon or sapphire, th...
The Crosstalk Curse: When Poking One Qubit Rattles Its Neighbors
A quantum processor is a crowded neighborhood. To perform useful computation, qubits need to sit close enough to interact, exchanging the entanglement...
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 Ion Shuttle: How Quantum Computers Move Atoms to Compute
Most pictures of a quantum computer show qubits fixed in place, wired up like transistors on a circuit board. Trapped-ion machines built on a design c...
The Yield Problem: Why Two Identical Qubits Don't Exist
Walk through any pitch about quantum computing and you will hear about qubit counts climbing into the hundreds and thousands. What you rarely hear is...
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 Calibration Treadmill: Why Quantum Computers Need Constant Tuning
Walk into a lab that runs a superconducting quantum computer and you will not find a machine that boots up once and stays ready. The processor drifts....
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...
The Coherence Clock: The Race to Make Qubits Remember Longer
Ask a quantum hardware engineer what keeps them up at night and you will rarely hear about qubit counts. More often it is a single, stubborn number me...
The Benchmark Wars: How to Actually Measure a Quantum Computer
Ask a quantum computing company how good its machine is and you will rarely get a simple number. You will get several, and they will not agree with ea...
The Trapped-Ion Edge: Why Floating Atoms Make Such Good Qubits
If you could shrink down and peer inside one of the quantum computers built by IonQ or Quantinuum, you would not see a chilled silicon chip humming wi...
The Photonic Gamble: Building a Quantum Computer Out of Light
Walk into most quantum computing labs and you will find a chandelier of gold-plated plumbing, cooled to a hair above absolute zero, or a vacuum chambe...