Atomic Cubit: the facts.

What is Atomic Cubit?

Atomic Cubit is a quantum computing company based in Hyderabad, India. It is designing a superconducting quantum processor called Nandi Q1, develops the error-correction software such a processor needs, and publishes quantum chemistry research.

Has Atomic Cubit built a quantum processor?

Not yet. Nandi Q1 is under development and no Atomic Cubit processor has been fabricated. Every hardware measurement the company has published so far was run on IBM Heron-class superconducting processors, accessed as a cloud customer.

Each published figure is labelled by its stage: designed, simulated, fabricated or measured.

What is Nandi Q1?

Nandi Q1 is Atomic Cubit’s first-generation superconducting quantum processor, currently under development. Its published design targets are a degree-4 qubit lattice, so that the surface code needs no added SWAP gates, plus mid-circuit readout, qubit reuse, real-time conditional logic, and a syndrome round budgeted together with coherence time. The implementation details are proprietary.

What has Atomic Cubit measured?

The results ledger lists each measurement with its conditions, acceptance rate, date and job ID. The main entries:

• 99.94% logical Bell-state fidelity for a [[4,2,2]] encoded pair, measured in three bases and post-selected at about 96% acceptance (95% confidence interval 0.999112 to 0.999608).
• 31 independent encoded pairs, 62 logical qubits, certified in one job, each above the 0.5 entanglement bound. This is a fleet of separate pairs, not one 62-qubit entangled state.
• A 5.5× drop in error from distance 3 to distance 5 in a one-basis repetition code, down to a floor near 1×10⁻⁵ per cycle.
• The cost of running a surface code on a degree-3 heavy-hex lattice: a logical error of 0.152 per cycle in the Z basis at distance 3.
• 83% fewer two-qubit gates on one circuit (3,710 down to 615) from hardware-aware layout.

These are error-detection results with post-selection. They are not full error correction, and no quantum advantage is claimed.

Can the results be checked?

Hardware results are published with their job IDs, acceptance rates and dates. Atomic Cubit states that raw per-shot data is archived and that each figure is re-derived offline from it. No third party has independently verified the results so far.

What did Atomic Cubit do with Google’s public data?

Atomic Cubit re-decoded part of Google Quantum AI’s public surface-code dataset, 17 of its 420 configurations, offline with the open-source PyMatching decoder. Logical error fell from distance 3 to 5 and from 5 to 7 in all eight comparisons (two bases, 13 and 30 rounds), with suppression factors from 1.23 to 1.90.

That is an analysis of Google’s measurement on Google’s hardware. It does not reproduce Google’s published factor of 2.14, and it says nothing about an Atomic Cubit processor. Conditions are on the results ledger.

Has Atomic Cubit published peer-reviewed research?

No. Its first paper, The Chemistry Performance Envelope by Pally Sai Tilak, dated 18 September 2026, is a research preprint and has not been peer reviewed. The paper, a supplement, and the data and reproduction code are free to download.

Papers on logical-qubit scaling, connectivity costs, Bell-state measurements and decoder validation are in preparation.

What is The Chemistry Performance Envelope?

It is a research preprint on what a quantum chemistry calculation really costs: the compiled circuit, the molecular energy reference and the noise, taken together. It reports a six-qubit circuit with 1,433 controlled-Z gates, and a hydrogen campaign in which the mean absolute deviation fell from 9.734 mHa for raw estimates to 3.153 mHa with readout and zero-noise mitigation.

It does not show the performance of an Atomic Cubit processor.

Who founded Atomic Cubit?

Atomic Cubit has two founders: Pally Sai Tilak, Founder and Chief Technology Officer, and Nikhil Bhushan Naidu, Co-founder and Chief Executive Officer. More on the company page.

Where is Atomic Cubit based?

Hyderabad, India.

Is the name Atomic Cubit or Atomic Qubit?

The company name is spelled Cubit, not Qubit. Atomic Cubit is not connected to the CUbit Quantum Initiative at the University of Colorado Boulder.

What are Quantamathical and El Rado?

Quantamathical is Atomic Cubit’s sister company, working on computational drug discovery. El Rado is its drug-design workbench: software that generates candidate molecules for known targets and screens them. The El Rado site is in preparation.

Is Atomic Cubit hiring?

There are no open roles right now. People who want to work on superconducting devices, control systems or error correction can introduce themselves through the careers page.

How do I contact Atomic Cubit?

Write to team@atomiccubit.com. The founders read that address. Atomic Cubit is also on X and LinkedIn.