Google Sycamore

Google Sycamore is a superconducting circuits quantum computer operated by Alphabet in USA. It has 53 physical qubits. It ranks 28 of 43 superconducting machines in this table by physical qubit count. 14 sourced specs are in the spec sheet. 1 published benchmark or milestone record are listed below, each marked by who measured it.

Also known as Sycamore processor

Google's 2019 processor with 54 qubits, of which 53 were used in the random circuit sampling experiment after one was unusable. Google reported a 200 second sampling task that it estimated would take 10,000 years on the world's fastest supercomputer. It was a research device with no public cloud access. The sources used do not state whether it is still in use today, so no current status date is given.

Spec sheet

Technical details as the builder or a paper states them, each with its own source. A blank is a fact we could not source, not a zero. Fidelity and coherence figures are in the benchmark table below.

Spec	Value	Basis	Note	Source
Processor	Sycamore, 54-qubit chip (53 usable) built from two bump-bonded dies	Peer reviewed	One of the 54 qubits did not work, so the 2019 experiment used 53 qubits.	nature.com arxiv.org
Qubit type	flux-tunable transmon qubits with adjustable transmon couplers	Peer reviewed	Supplement: 142 transmons on the chip, 54 used as qubits and 88 as adjustable couplers.	nature.com arxiv.org
Topology	rectangular grid, each qubit tunably coupled to four nearest neighbours	Peer reviewed	Coupling between neighbours can be tuned from off to 40 MHz.	nature.com arxiv.org
Max connectivity	4	Peer reviewed	Each qubit couples to up to four nearest neighbours in the grid.	nature.com research.google
Couplers	86	Peer reviewed	Paper says the 53-qubit device uses 86 couplers; the full 54-qubit layout has 88 per the supplement.	nature.com
Native gates	microwave single-qubit rotations and an iSWAP-like two-qubit gate (fSim family)	Peer reviewed	Entangling gate is an iSWAP-like swap with a small conditional phase, run by tuning neighbours on resonance.	nature.com arxiv.org
Single-qubit gate time	25 ns	Peer reviewed	Single-qubit gates are 25 ns shaped microwave pulses.	nature.com
Two-qubit gate time	12 ns	Peer reviewed	Two-qubit gate uses a 20 MHz coupling for 12 ns; supplement says 12 ns trades decoherence against leakage.	nature.com arxiv.org
Cooling and environment	dilution refrigerator, chip cooled below 20 mK	Peer reviewed	Supplement also estimates the refrigerator draws about 10 kW.	nature.com arxiv.org
Operating temperature	20 mK	Peer reviewed	Paper says the chip is cooled to below 20 mK, so 20 is an upper bound, not a measured value.	nature.com
Power draw	26 kW	Peer reviewed	Supplement estimates 26 kW total apparatus draw under worst-case chilled-water conditions, about 10 kW of it the refrigerator.	arxiv.org
Fabrication	aluminium on silicon, two dies joined by indium bump bonds	Peer reviewed	Paper describes the process (14 lithography layers per the supplement) but the facility is not named in the text read.	nature.com arxiv.org
Successor	Google Willow	Vendor reported	Willow papers compare against earlier Sycamore processors and Google calls Sycamore the previous generation.	blog.google nature.com
Roadmap	first in a series of ever more powerful processors, aimed at fault-tolerant quantum computing	Vendor reported	Google said this in its October 2019 post describing Sycamore.	research.google

Milestone claims

Google claimed quantum supremacy: 53-qubit random circuit sampling in 200 s vs an estimated 10,000 years on the world's fastest supercomputer (2019-10, vendor reported) research.google arxiv.org

Timeline

2019-10: Announced

Comparable superconducting machines

Closest in physical qubit count within the same technology. Counts of different qubit types are not interchangeable across technologies.

Machine	Operator	Qubits	Status
Euro-Q-Exa	LRZ	54	operational
IQM Emerald	IQM Quantum Computers	54	operational
IQM Radiance NOX at CINECA	CINECA	54	operational
VTT Q50	VTT	50	operational
G-QuAT System F	AIST	64	operational
Origin Wukong	Origin Quantum	72	operational