Yes—but only with careful engineering. Ultracold dipolar molecules can offer long-lived internal states and controllable, long-range interactions useful for quantum simulation and computation. Those same interactions can also erode coherence, while collisions can remove molecules. Researchers have extended coherence or suppressed loss in particular experiments; the results do not show that molecules are universally more stable than other quantum platforms.
What does “stable” mean for a quantum system?
Stability is not a single measurement. It can mean preserving the phase of a chosen quantum superposition, keeping molecules in a sample rather than losing them in collisions, or maintaining enough control to perform a particular computation or simulation. These are related but distinct goals: a gas can have a long lifetime without having equally long internal-state coherence, and a coherent state under one set of conditions does not prove that every interacting configuration will remain coherent.
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- Coherence: How long a prepared superposition retains measurable phase or Ramsey contrast, with or without techniques such as spin echo.
- Lifetime: How quickly molecules are lost, including through collisional or inelastic processes.
- Control: Whether researchers can prepare and measure the desired states, tune interactions, and control molecular spacing for the task.
These distinctions matter because computation, quantum simulation, precision measurement and a long-lived quantum-degenerate gas place different demands on a platform.
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Many internal states create options
Molecules have a richer set of internal states than simpler atomic systems. A 2024 review by Simon L. Cornish, Michael R. Tarbutt and Kaden R. A. Hazzard identifies their stable states, strong transitions and long coherence times as useful features for quantum computation and simulation. That internal structure can provide choices for encoding information or building a model of a many-body system.
Long-range interactions are a resource and a noise channel
Dipole–dipole interactions can couple molecules over distances and support entanglement and many-body dynamics. But an interaction that helps create correlations can also make the system more sensitive to its configuration. In a 2024 RbCs experiment, oscillating dipoles made dipolar interactions the dominant observed cause of Ramsey-contrast loss for the tested superpositions. The interactions are therefore not a blanket source of stability: their strength and the molecular states used determine whether they serve the task or limit it.
How researchers engineer longer coherence
Reduce differential light shifts with a rotationally magic trap
An optical trap can shift different rotational states by different amounts, causing their relative phase to drift. A rotationally magic trap is engineered to reduce that differential shift. Gregory and colleagues measured a Ramsey coherence time of 0.78(4) seconds for 87Rb133Cs rotational-state superpositions in such a trap, in the absence of dipole–dipole interactions.
Use spin echo to refocus some dephasing
A spin-echo pulse can reverse the effect of some slowly varying, single-particle phase shifts. In the same RbCs study, a single echo produced no observed fringe-contrast loss over 0.7 seconds. The authors estimated a coherence lower bound above 1.4 seconds at 95% confidence; that is a fitted estimate, not a directly observed coherence duration beyond 0.7 seconds.
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The same work also examined RbCs superpositions that generated oscillating dipoles in an interacting regime. There, the measured 1/e coherence times were 89(5) milliseconds without spin echo and 157(14) milliseconds with spin echo. For the coherence comparison, the experiment varied the effective dipole moment from 0.31 to 0.65 D and found coherence time inversely proportional to interaction strength, which scaled with the square of dipole moment. The contrast with the noninteracting result shows why coherence figures need their operating conditions attached.
How researchers address molecular loss
Loss is a separate stability problem from loss of phase coherence. Collisions can remove molecules before a coherent operation or simulation is complete. In a 2024 Nature study, enhanced collisional shielding enabled evaporative cooling of NaCs molecules to a Bose–Einstein condensate. The reported sample had a 60(5)% condensate fraction, a temperature of 6(2) nK and a lifetime close to 2 seconds. This demonstrates progress in suppressing loss in that particular system, not that all molecular gases are inherently long-lived.
A separate 2024 study of paramagnetic polar molecules reported a region of experimental parameters in which pure ultracold LiCr samples had a lifetime exceeding 0.2 seconds. Its abstract reports a 3.3 D electric dipole moment for the candidate doubly polar molecule. These LiCr figures describe a different species and experiment from the RbCs coherence and NaCs condensate results.
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What the reported measurements show
The values below describe different observables, species and experimental conditions. They illustrate progress on separate stability challenges; they are not a controlled ranking of platforms.
| System and study | Reported result | What the result measures |
|---|---|---|
| 87Rb133Cs; Gregory et al., Nature Physics (2024) | 0.78(4) seconds | Measured Ramsey coherence in a rotationally magic optical trap, without dipole–dipole interactions. |
| 87Rb133Cs; Gregory et al., Nature Physics (2024) | No observed contrast loss over 0.7 seconds; estimated coherence lower bound above 1.4 seconds at 95% confidence | Spin-echo result; the longer figure is an estimate, not a measured interval. |
| 87Rb133Cs; Gregory et al., Nature Physics (2024) | 89(5) ms without echo; 157(14) ms with echo | Measured 1/e coherence times for superpositions producing an oscillating dipole in the reported interacting regime. |
| NaCs; Bigagli et al., Nature (2024) | Lifetime close to 2 seconds; 60(5)% condensate fraction; 6(2) nK | Lifetime, condensate fraction and temperature reported for a molecular Bose–Einstein condensate enabled by enhanced collisional shielding. |
| LiCr; Ciamei et al., PRX Quantum (2024) | Lifetime exceeding 0.2 seconds in a reported parameter region; 3.3 D electric dipole moment | Lifetime of pure ultracold samples in the stated region; dipole moment reported in the study abstract. |
How to assess whether a molecular platform is stable enough
Start with the task, then compare like with like. A coherence measurement in a noninteracting gas does not predict coherence in a strongly interacting simulation, and a condensate lifetime does not measure phase coherence. For a meaningful comparison, check:
Best Value
- The observable: Is the claim about Ramsey coherence, loss lifetime, condensate properties or another metric?
- The operating regime: Were dipole–dipole interactions present, and what states, trap and echo conditions were used?
- The interaction controls: Can fields, state choice or other controls tune interactions without adding excessive decoherence?
- State and position control: Can the experiment prepare and measure the required molecular states and control spacing, for example in a lattice or tweezers?
- Task fit: Does the reported performance address the demands of the intended computation, simulation, measurement or gas preparation?
The cited results are from specialized ultracold-molecule experiments using traps, lasers and controlled fields. They establish promising engineering approaches in specific systems, not a consumer product or a universal stability advantage over other quantum technologies. The cited publications are from 2024; these results alone do not establish which experiments are newest worldwide as of 2026.
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